I have a very badly damaged leg from being crushed while in the military. I couldn't walk for a year and finally I got a Disabled Parking Placard so I could get the disabled rate for the train that I used to take to work ($30 vs 160). After reading the fine print I found some really interesting things, like I don't have to feed the parking meters and I can park in spots for longer than the posted times. Needless to say, I have not paid for parking in 5 years.
But I degress;
Since I am "disabled" (I cannot run), I consider any incident that I cannot talk my way out of as me backed into a corner. If I felt that someone was going to harm me, my wife or children and I could not back away safely. I would be able to consider using force. (Now before anyone jumps all over this, Force is the LAST resort after trying all other things) Since I can't flee without being caught by even the most out of shape 2nd grader, fleeing (anything more than walking backwards) is not factored in to the equation in my mind. Keep in mind that I once told a guy that his girlfreind could kick my butt so I could avoid a fight.
A guy got out of his car that was in front of mine and hit me in the face at a stoplight. I tailed him till the cops arrived and he got charged with assault and went to jail. His lawyer called me up wanting my side of the story and I told him what happened (Road rage 18yr old kid) He asked me if I got out of my car and I said "No, truthfully it would have been hard because I am disabled"
Silence...
"Do you have a parking thing or plates?" "yes." "okay, was it up at the time?" "I think so...but I am not sure. If you need me to testify in court I will be more than happy to come in" "No, that won't be needed, thank you for your time"
I bet if you got in a situation that you had to use force and they found out you were disabled, they would not try to railroad you, if they did you could always call the ADA. The kid got a lesser assault charge.