This has a few things I would like to address. Also, to preface this post...Yes, I know this isn't a perfect world.
I'm a total jerk out there to everyone around me, and being dangerous and beyond rude in an aggressive fashion.
Let's start with this one. I don't feel that a person in this state of mind/exhibiting this behavior, should be driving at all. It's reckless to do so, and reckless driving is something that should not be done. Can we agree on that?
I know that tons of people do that, but ideally, licenses wouldn't be given out to those who do so as the norm, and those who don't, would refrain from driving in such a state. It's necessarily going to ever happen, but it would be nice.
So I take 2, hell let's go crazy and make it 3, nice hits of some Candyland (upbeat sativa that will still give you a nice chill-out) in my MVT. I chill out. I don't care about the other assholes other than to stay out of their way - and this becomes MUCH easier, because now I'm not trying to get around them as fast as I can or changing lanes coming into or taking off from traffic lights. I'm not riding up their ass flashing high-beams, or any of the rest. I'm just kicking back with some tasty tunes - much more relaxed & much less aggressive. My ADHD levels a bit and I focus on my driving, instead of all the other assholes on the road, or "why do they have to be working on this damned road now?", or whatever else.
Now, for this hypothetical person, this constitutes at least a mild buzz, yes?
In your view I'm still more "impaired" because I took a few hits instead of flying around on the caffeine buzz I have, or whatever chemical imbalance in the brain that makes assholes like this tick? Am I also less safe? Because this seems to be what you're saying in most, if not all, of your posts.
Do I believe this person is
more impaired? Possibly, but not necessarily. That depends a lot on just how badly you would've been driving, and just how buzzed you are.
Is he
less safe? Again, possibly, but not necessarily.
I don't believe to have claimed that someone would necessarily be
more dangerous on the road with a Cannabis buzz, than they would if they are suffering some affliction, be it a bad mental state or symptoms of a disease. If I did, I would like to clarify by changing that to a "possibly, but not necessarily".
Or, do you feel I, and those who have to share the roads with me, are better off? That my "impairment" - though in a different direction - isn't as bad as whatever impairments I had before (be they physical, self induced through too much coffee, or just a dick)?
Like I said in my answers to the above quote, I wouldn't rule out that this person and those around him
may be better off, depending on on the levels of each form of impairment.
If you're in with the latter, then it becomes a discussion of levels of "impairment" and which is better for me and everyone else. And, the lesser of two evils is a real one - not that there is an option of "no evils" as you say above.
This is where it all comes together. While this person may be less of a danger due to using Cannabis, that doesn't automatically mean he should be driving with a buzz. The two don't just line up in an "if A, then B" manner. I personally believe that there IS a "no evil" option, of the person just not driving. If he can't drive without some form of impairment, he shouldn't drive at all.
It's very hard to put impairment on a scale, and if we managed to do so, we'd have to find a "Lv.0" baseline that would constitute safe mental/physical reaction times, environmental awareness, and behavioral choices. e would then have to determine what level would be the cutoff,
Say on this scale, the angry person was at a Lv.5 in terms of impairment, and Cannabis brought him down to a Lv.4. That's still significantly impaired. In my opinion, he shouldn't be allowed to drive. If someone who suffers random seizures is at a Lv.7 and Cannabis brings them to a Lv.4, they shouldn't be allowed to drive, either.
Again, though, without some kind of high-tech machinery, accurately putting various types of impairment on the same scale is likely going to be extremely difficult, and without that ability, we'd have to leave it up to each person. Do you really trust most people to be responsible about keeping their level of impairment down using their own judgment, or to even be correctly able to assess that? Given the judgments people make about their intoxication levels on alcohol, where they say they are fine (and often truly believe it), I don't.
For people in cities, there are always hire-a-driver options (cabs, taxis, Uber, etc.), and for those without access to those services...not everyone should be on the road. It does suck if you aren't able to drive without significant impairment, in some form or another, to be prohibited from driving at all, but when it comes down to it, driving isn't a right as much as it is a privilege.
Also, when it comes down to it...What percent of people do you believe would truly be safer/less impaired on the road, with a Cannabis buzz? I think it would be an extremely small percent, and that the vast majority would be more hindered than helped.