First of all, Evenepoel's swerve is not that severe untill the Trek rider clips him. He only moves to the side maybe half a meter. And as you noted, the Trek rider is coming from behind with more speed so he is the one with a better view as it happens in front of him. He Trek rider's cutting in swerve is also harder and faster. Evenepoel is not without blame, he should have been looking to the side he wanted to peel off to, but the blame does not fall solely on him, as people here are trying to portray it.