

Not just valid, I’d argue important. It doesn’t make the most exciting headlines and doesn’t get funding very well, though, so it’s not done nearly as often as it should be. A big part of science is not taking things at face value and verifying that there is sufficient proof for claims.
Plus, if both results agree, it statistically tightens the probability of a coincidence. The chances of a 5% chance event happening twice in a row is 0.25%, and three times in a row is 0.0125% so repetition can make the results more certain.
I don’t think it’s cultural. I think it’s republicans repeatedly targeting education for decades. I mean have you ever been in a teachers’ subreddit or community? Modern American education is a fucking dumpster fire.
Remember Trump’s “I love the uneducated”? It’s not because he’s friendly, it’s because they’re more manipulable.