This question already has an answer here:
Imagine the following scenario. A user gets suspended (fairly) on some site, then creates a new account and asks an on-topic question (the new account asks the question and does nothing else). The IP address, writing style or some other information allow to identify the new account as a sockpuppet beyond reasonable doubt. Is it OK for the moderators to delete or close the on-topic question then, purely because of the past actions of the person who asked it?
Since MSE is not about discussion, I am looking for a generally agreed upon policy. My personal opinion is that it is not OK because Stack Exchange is about content, not about people, and on-topic questions should be welcomed from any source.