The injury situation under Ange was unprecedented, it wasn't unreasonable at the time for people to suggest, based on the intensity of his style and commentary from people who had worked with Ange, that he would have contributed to it. You cannot not discuss something because it might hurt someone's feelings. It now appears that the injury situation is still happening when he is no longer here, that there is more to it than just Ange. So it is unreasonable to keep making that claim unless new evidence comes to light.
Idiots will always do that, they racially abused Kevin Danso last week. People screaming abuse shouldn't preclude l sensible discussion of a topic by other people, some of whom are well informed on sports injuries. And having a go at them may put people off stating very valid views.