It is really up to you whether or not you think everyone in Hamlet is truly corrupted. Some may have the opinion that Hamlet isn't corrupted, along with some others. But some options is to consider the political structure at the time, which seems to be a drive for some of the corrupted actions in the film, and mainly explains characters like Claudius, Laertes and Polonius.
Sexual corruption may also be another thing that could be related to Gertrude, however this is highly debated. Horatio is sometimes considered as being the less corrupted individual in the play, yet then again he seems to just function by how Hamlet acts, so this depends on whether or not you think Hamlet is corrupted too.
There's also some other philosophical and psychological points of view in terms of corruption, Hamlet may earlier think he is corrupted by this mentality of inactivity and existentialist thinking, or the whole psychoanalytic idea of ambivalence and repressed desires as contributing to the corruption.
