Tweety, try not to take things so seriously. Consider that you posted a thread that you wanted input on, and you got it. I don't think people are judging YOU but trying to tell you that if you were to do that there would be consequences for you. I'm no expert but that was my first thought too that if you sprayed antifreeze on them, they get into an accident and die then not only would you be liable but wouldn't you feel pretty bad for the rest of your life thinking you did that to someone for simply tailgating you?
I've thought of scenarios like this often, especially when I'm pissed off and then I take a breath and realize that my actions could change the course of someone's life, least of all mine.
I used to brake check tailgaters but then read about people who did that and got into some serious legal issues as a result. Do I want to spend $100K in legal fees to defend myself against the guy who tailgated me? Nope.
So, Tweety, I'm not judging you (had you actually done this I might) but putting my $0.02 worth as you asked. I don't know you from Adam but in reading your replies you do seem to be pretty pissed off (whether at this thread or in general I have no idea), and there's few things on this board that should really get under you skin IMHO.
In the words of Jack Nicholson in Anger Management: goooooosfraaaaaabaaaa.