Let's say I generate a new address and by some miracle it has Bitcoin already in it belonging to somebody else. Is it legal to just take it? I understand those odds are very low, no need to lecture me, I'm just interested.
Yeah stealing Bitcoin is illegal because you are taking something that does not belong to you so it still is stealing even tho it is online.
You should have more wallets if you want to prevent Bitcoin being stolen from you.
More paper wallets, not online ones. Paper wallets are the safest. I feel way safer since I have moved my balance to dozens of cold wallets.