Because there is no centralized entity whom you can ask to do that, that's the whole point. Only the change to the community controlled consensus - (most of miners, node runner, validators and users agreeing to it) can achieve that, but there is no interest in that as it would undermine one of the main principals of crypto currency and it's cash like properties - transaction irreversibly.

Well if you did that, then crypto would cease to be useful as a criminal currency, wouldn't it?

Something like this happened with Ethereium iirc and the coin split into two. One were the transaction was reverse and the OG one. But they were able to reverse the transaction because all the biggest holders decided to. Not sure if those coins stole from binance are as centralized as Ethereum was at that moment to be able to do it.

A blockchain doesn't actually provide control over a transaction, it just verifies that it happened. It's supposed to be a long, immutable record of every transaction that has ever ocurred, which is precisely why transactions can't be reversed. The work of verifying those transactions is performing by miners, or some other "proof of" design where you have an authority in the chain that confirms it.

Basically, it's nothing more than a fancy receipt.