I mean, it’s usually used to undermine a cause by killing their leaders, but their death can also cause them to become a martyr and get even more support. Which is generally true for the majority of assassinations?
Why I asked? Because recent events in Ecuador got me wondering.
https://en.wikipedia.org/wiki/Martyr
Since you’re asking which is generally true: I think most victims of political assassination aren’t Martyrs and just disappear. Think of all of the victims of the CCP, the Nazis… All the other genocides in history… There are a few hundred high profile martyrs and several million dead without a wikipedia article and without having changed history around. This is probably the sad truth for the majority of cases.