Hamlet's Imminent Revenge

There's a reason that Hamlet didn't immediately kill his uncle when he got suspicious- common sense. In Hamlet, Hamlet's father was killed by his uncle, who immediately married Hamlet's mother. Of course, Hamlet was suspicious about the matter, but not suspicious enough to take action. He mainly just moped and whined for the first couple paragraphs about it. However, when his father's ghost warns him about it, Hamlet immediately sets out to kill his uncle. If he suspected it, why didn't he act?

Some people think this is misplaced logic, but it makes sense for Hamlet to not immediately kill his uncle. Think about it: if you think that your brother stole some candy out of your Halloween stash, you don't immediately ambush him at the bottom of the stairs with an automatic nerf gun. You do a little investigating! When you find out that he did it, THEN you ambush him with your nerf gun. If you want to avenge a murder, and you do it the wrong way, you become exactly what you are seeking to destroy. It's a terrible idea to take action without proper information about exactly why you're attacking.