What's so controversial about High Noon (1952)?

Well I watched Rio Bravo and because Wayne said he made it as a response to High Noon, the movie feels like a Sheriff's wetdream where he has all this help and everyone wants to do their part. It's a good movie overall, but it doesn't feel near as special as High Noon I would say.

I mean it's like if a Hollywood filmmaker were to watch a movie like In The Heat of the Night, back when it came out and didn't like the idea of a black cop from the North, receiving prejudice while trying to investigate a murder in a Southern town. Imagine if that filmmaker said In the Heat of the Night was Anti-American, and decided to make a similar movie where a black cop from the North goes to a Southern town, and is met with a warm welcome, and is given all the hospitality and police power he could ask for.

That could be a good movie too, but it feels like all the depth has been stripped, and that's what I feel Rio Bravo did to High Noon.