Well taking the fact that even tho you might miss the pilot cockpit the mech will take tons of dam from any class of mech landing on top of it, it may not kill the mech or mechwarrior but it should make for alot of dam, not to say the leg on the mech trying to do DFA will take some type of dam. As for aerospace fighter running there fighter into a mech, will if u got no weapons or you are near dead, why not kill yourself to kill a mech thats more over unharmed, Thus killing a mech that will do more harm to other.