He was pointlessly brought back only to once again get humiliated and defeated.
__________________ Chicken Boo, what's the matter with you? You don't act like the other chickens do. You wear a disguise to look like human guys, but you're not a man you're a Chicken Boo.
I think it hurts since he comes back to lose with all those ships capable of destroying planets, immense prep, against a scavenger and regular people in ships. It was not even a proper navy and they just showed up and fought. No organization. If you think about it Palpatine was only really successful when he snuck around. Only time he won was due to luck with Anakin saving him and he launched a massive secretive assault against the Jedi. He would have been better off staying dead.