If one insults The Prophet (PBUH & HP) or an Imam (PBUT) or any Holy figure, like Prophet Jesus (PBUH) too for example, am I in the wrong for believing they should be hit?

I’m talking about someone who insults them on purpose

Hitting someone is not allowed, unless it is in a war situation, or by the order of a judge. The judge would look at the situation and assess it based on the intention and the knowledge of the individual, and so on.