Don't blame the player for responding to the game...
Blame the game.
PD's draft is WAY hyped. The reason you DON'T see behavior like this IRL, on the whole, is that the draft is exaggerated and extends too far back.
Also, IRL racing, they have these things called 'Stewards'! THEY make the determination whether what you do is dangerous or just a 'racing move'. In the game, a crash is the only Steward!
Rather than bitch at each other for responding to the game's physics, bitch to PD at how BAD their draft physics are.
Personally, I'd like to see a 'Drafting Strength' slider, ranging from today's level, all the way down to about half. Option to the lobby creator. And use THAT instead of Boost, which is an abomination in the eyes of the Lord (of racing!). You want to allow the rear cars a BIT of a chance to catch up, bring it up to today's level. You want realism, set it back to 50% (which I think is more accurate).
And how hard would it be to have the game penalize a blocker on the straight? One racing move, then, if repeated, your engine gets a ten second cut. Only active if the other car is within one car length and gaining at a preset percentage.
Without Stewards, it is the GAME'S responsibility to police fair racing. Leaving it to the drivers themselves is something that even PRO'S don't get asked to do. The 'red mist' prevents it being used fairly. Personally, I wish FAR more effort were spent on details like this than silly graphic details that don't promote fair 'RACING'.
Trouble is, of course, your average ten-year-old doesn't appreciate anything he can't SEE...
