How is revenge justified in hamlet?

Claudius goes on to bribe Hamlet's friends and while they do protest they end up accepting anyways in hope of helping their friend. I belive that would be considered justified.

Emma’s parents went away on vacation for halloween and since she was going to be home alone she decided to invite her friend Rebecca over. Since it was the night of halloween kids would come dressed up as all different things, knocking on Emma’s door while they pass out candy. After all of the trick or treating was over they watched movies, ordered pizza, and even gossiped a little bit. When it was time to go to be Emma slept on her bed and Rebecca slept on a Fulton. Out of nowhere Rebecca jumps up and starts shaking Emma. “Emma wake up i want ice cream”. Emma keeps grunting and mumbling so Rebecca keeps trying to get her to wake up. She shouts some more “i want ice cream come on lets go get ice cream”. Emma says “ no i dont want ice cream go to sleep Rebecca and we dont even have none here anyways”. Rebecca says “good lets go to the store then” after a few more minutes of Rebecca trying to get emma to go get ice cream with her she finally gets up. They get dressed quickly and run out the house. Emma noticed that they were going the opposite direction from the store. She asks Rebecca “where are we going”. Rebecca replies “ the police station, i looked in the mirror and seen a guy under your bed with an axe”