Mainly because they are driven off road in questionably safe conditions
I agree with you there.
by individual who, as a group, tend to think they are cool and indestructible.
That's a blanket generalization. (Also,"individual, as a group," contradict each other.) You can't say everyone who rides an ATV or Jetski thinks they are indestructible. I'm sure there are some very reasonable and responsible riders out there.
The instances of people drinking and driving an ATV, Snowmobile or one of these is significantly higher than it is for drinking and driving cars, mainly because enforcement is more difficult.
I find that extremely hard to believe. I would very interested to see your source on that statistic. I would actually think the exact opposite is true, and many more people die in alcohol related auto accidents than in alcohol related ATV accidents, proportionally.
These are use for recreation and while Autos can as well, they are not in the same class and have significantly more government mandated safety features built into them.
Actually, the initial use for these quadskis is meant for search and rescue and emergency service operations, not recreational use. As they progress beyond the concept/prototype stage, then yes, they will be more widespread for recreational use, and there will be those yahoos who use them recklessly.
Your point that they are not in the same class as autos and have less government mandated safety features is a good point, and a valid one.
Again, I don't ride ATVs or Jetskis, and I think that their negative impact on the environment and natural habitats is one thing, but calling people who do ride them "stupid" and "morons" is a little uncalled for. Isn't there some kind of forum rule against name-calling? There may not be many riders on this forum, but if there are, I'm sure you offended them.
Besides, you gotta admit, isn't there some part of you that thinks those things are just a little bit cool?