You can do that, but you probably shouldn't. Would you buy a coin that someone can (and has) just take away that simply?
It's possible to fork a coin and rob somebody, but why would anyone "invest" in a coin when it's been proven that it's simple to just take them away?
I believe extenuating circumstances such as Paycoin, where its birth was created within a company that has failed at levels in which any board or investor would have crucified long ago.
A [hard] fork is a fork, and should not be taken lightly. It's not like a fork will happen every day and there is the potential of having multiple people put on the "blacklist". Getting a fork to get integrated smoothly is NOT an easy task. I helped Dogecoin when AUXPoW was done, and let me tell you there are a hell of a lot of more people than you can imagine just on the non-person side to get a hold of to ensure it goes over well.
So perhaps I should tell you to go fork yourself (a little fork joke

).
How exactly would the "bad" addresses and "people" be determined? I for one do not see how it is possible, especially with a clusterfuck like Paycoin where the one thing Josh has been doing with proficiency is mixing
millions of coins since day 1. Now there are supposedly millions of coins "stolen" and in the hands of "hackers" . Who exactly decides which coins are to be kept and which eliminated? The people who supposedly did the theft? I have heard repeatedly that you are one of the "best" people in the crypto world, but hearing such complete and utter nonsense about
fixing Paycoin come from you makes me think otherwise.