Diavolo didn't really deserve infinite death, but it's Diavolo, you gotta make sure he doesn't get the chance to strike back.

Yeah. Imagine if he actually gotten King Crimson Requiem. Sheesh, that wouldn't end well......

At best he deserves is a well received beatdown which kills and obliterates him. But dying an INFINITE amount of times is just way too much. Prob one of the most cruelest things to experience/happen in fiction

Infinite suffering for FINITE sins?

It's just a way to make sure he's not a threat anymore, one way or another.

BalangerM2: the story itself shows that he wasn't worth it, so there is not "what if...".

The man peddles hard drugs to kids

Dio deserved it more.

Yes.