What's the benefit on it? It's for the benefit of the hackers and scammers instead. Even storing it in cold storage is prone to danger when you sync it online. Imagine if this is the world's standard. You have every true evidence to show and can track where your money went off and then the bank will just say to you "sorry it's done". In banking system at least your money is fully insured and secured. Even when your depository bank went bankrupt, robbed or burned down.
Imagine you sell something for 3BTC. They send the BTC and say 'I'll ship it in the morning'. You check your wallet and the BTC is gone, he reversed it. Oh dear! Now you have no BTC
and no item.
BTC would sure be great if it was reversable, you're right. Would make scumbag's lives so much easier.
To your second point, Bitcoin is meant to be the complete opposite of banks, in that it is decentrilized. If it were reversable, it would mean that a certain person would make the call on what should happen. That would create a definite bias, which is extremely counter intuative.
It's
your responsibility to store
your Bitcoin in a safe way. If you're like OP and just leave over $10,000 sitting around on your main PC, I'm sorry but you're an idiot.
No one is here to hold your hand or reverse anything when you cry out. Take responsibility for your own belongings instead of wanting someone else to do it for you.