I'm not a coach, and I'm also closer to being a high-school parent than some who have posted. I was a newbie sports parent who spent lots of time wondering why the coach did things. Never ever said anything, but wondered. So I get where the OPs (there are 3 or 4 of them on this thread, I think) come from. Every parent I have known second-guesses coaches about something! By senior year of high school, I understood and approved of most of what the coach had been doing for 4 years; freshman year, there were lots of unasked/unanswered questions, and to this day, there are some things that I still don't understand.
I completely agree with Coach May about character. I saw my son do things that made me proud of him as a person, but I expect that, 10 years from now, I may realize what those were better than I do now. In the moment, you only see what's happening in that moment, and you react without knowing how things are going to play out. Hindsight solves a lot of problems!