You're really going to have to dissect this issue...
First, if we're going to play the "SeriousRP" card, we need to enforce SeriousRP in all aspects of this server. You have players who drive these vehicles like a bat-out-of-hell which realistically would seriously injure or kill your comrades in such fashion. Is it impractical to train others on how to jump out of harms way? No.
Second, let's not forget that those who are participating in this training are doing so willingly and are not reporting this situation.. Why? Because it was their choice to do so, and if I had to guess what was on their mind, they were probably having fun.
Let's stop making mountains out of molehills and get back to enjoying Garry's Mod. This isn't 1942RP.