You say that you don't think the coach would act against the best interests of one of his players. Personally, I think most kids are going to be perfectly fine whether they go to Michigan or Ohio State. They are both very good schools within easy driving distance. I can't confidently say which school they will be better off at.
The real allegation is that Wilcher was working to help his alma mater and did all that he could to make it easier for his former teammate to recruit a player on his team. Weber was going to be fine wherever he went. Then after the decision was made Wilcher went to the media to throw mud at Ohio State's venerable head coach. He is heavily biased toward Michigan and his comments should have been discounted. They were not though and it lead to lots of negative news stories. That's why people weren't happy.
As a side note, I don't see why an OSU assistant leaving after signing day is a big deal but a Michigan coach telling a recruit that OSU doesn't use big backs isn't a big deal. That back that Michigan got a couple years ago has really suffered from the lies of Hoke's staff. Due to their poor development of him he may have lost millions of dollars in future earnings. He could have been as good as Hyde and Zeke.