True, but people see Prost as the ultimate evil in there, all he did was to not bend down like eveyone would do to Senna. I'm not saying it's right, but there you go.
He didn't have to bend, he just should have accepted that Senna took the inside and was alongside him... That's racing, take the inside it's racing, probably 60 or 70% of overtakes are like that, what certainly is not racing is to turn in 5 meters before the apex just to hit the car that won position, that's cheating. Prost noticed he lost the position and tried to end both races there, that's pretty obvious. Everybody can see it. If Senna's car wasn't there he would end in the grass...
In this story there was 2 guys cheating, Prost in 89, Senna in 90. The problem is even cheating Prost won the tittle, so If that was the only way to win, Senna learned the lesson and ended both races intentionally too. And he won. The difference between them is that Prost did it first and worse than that ended crying to Ballestre who decided to give him the tittle because Prost's tears were almost drowning everybody around him.
Prost was smashed by Senna in their years, Prost was the man until Senna was in the house. He only won cheating and driving one of the best cars of all time, one of the better Newey's masterpieces. In 88, lost, in 89 Ballester offered him the tille, in 90 lost, in 91 was fired from Ferrari, in 92 was recovering from the hit and in 93 with a space ship lost 4 or 5 races to Senna that had a very inferior car. In 94 just quited because Senna was coming again to be his teammate. He was a traumatized man and he knew he had no talent to match Senna. He was the closest man to beat Fangio until then, but the horror to be smashed again by Senna was too much for him.