I think he recognizes that there are different thresholds for proving something in court versus determining whether somebody is fit to lead young men. What I'm not sure he recognizes is how difficult it is to even make an arrest in domestic violence disputes. That means he essentially had no objective information to base his decision on beyond the allegation itself.
If he's required to report any allegation to administration (which I believe he is), then they would be justified in firing him. There is a reason they make those particular reads as simple as possible for coaches - they want to eliminate the possibility that bias or loyalty influences their decision to help a victim. Clearly, that process failed. Whether it failed because Meyer misinterpreted the protocol or because OSU failed to communicate his responsibilities, I don't know.
Meyer doesn't come out of this looking good by any stretch. I don't like him, I've never liked him, and this certainly doesn't make me like him more. I just don't see any of this as some egregious moral failing. None of it adds up. Why would he risk everything to keep a WR coach? It's not even like he's the one who would have had to make the decision. He just had to follow the protocol. The entire system is structured to preserve his innocence, both personally and professionally. Worst case scenario, he cut corners you can't cut to show trust in a friend. I'd almost respect it if I wasn't so sure it was out of stupidity rather than loyalty (as he proved by throwing him under the bus the other day).
You'd be surprised by how often the worst people tend to be the most self-righteous. Meyer strikes me as one of those guys. His commitment to respecting women is almost certainly dripping with misogynistic undertones, but that doesn't mean he's gonna chill as someone abuses their wife. I'd actually expect him to be the sort of pathological virtue-mongerer who wants to live in a society where people who steal have their hands cut off and everyone who doesn't read the Bible is punished by an eternity in hell.
If people want a scapegoat they probably got the right guy, maybe even for some of the right reasons, but with the wrong guiding thought process.