>>107127371In some cases, that's literally what the enemy wants, so that they can become the martyr, hoping to perpetrate their ideals/ideology/beliefs. Thus, it's important to not immediately kill the enemy, but to arrest him, give him a trial, smear his reputation to the ground, make the majority believe that the enemy is wrong or never had a solution worth following, and then get rid of him until the enemy is forgotten and the ideals or ideology the enemy wants to spread falls into irrelevancy.
Then, depending on the situation, the enemy can be executed, or if the government can afford it, be further humiliated by having the enemy kept imprisoned, so that everyone can see what loser the enemy is.
In other situations, it is advisable to immediately kill the enemy to reduce further harm.