@Istvan90623
The assassins aren't really a problem for him. He already wiped out a group of them before. The problem is that he doesn't know how big the organization is.
If he kills every assassin that is sent after him then it would just highlight his threat level on the organization. It's annoying and if they have pull in the government then it's double annoying.
Rather than deal with that, he wants to be labeled as someone with no-threat to the organization, so they leave him alone.
If he deals with them and some members have official positions, then he would likely need to do some political stunt to take them down. His solution is to keep his head down for a few days or weeks rather than spend years wiping them.
Think of it this way, you don't know where the colony is but ants keep appearing on your countertop. The solution is to clean the countertop rather than find and destroy the colony.