It's very much a fundamental misunderstanding of how science works. Almost nothing in science has an answer, and if you let your brain lock in that way, you forego the opportunity to ask interesting questions. It also leads directly to lots of downstream pathologies common in amongst laypeople (e.g. "The Science is Settled", which it almost never is).

> Going further, yes, this is a new theory among others, but afaik is the first one with strong evidence.

I am not an expert in this field, but others have evidence too. Particularly when asking "why" questions like this, the bar for proof is incredibly high.