Yes. Murdering people that you disagree politically with is wrong. Even the actual nazis were allowed to surrender and stand trial. Vigilantism is nearly always a bad thing.
If you don't see the power imbalance between the government and the people, then you are very lucky that you had not experienced it.
Not trying to justify murdering, but some kind of deterrence for oppressing peaceful, freedom-loving people is not a bad thing. Of course if it become French Revolution style execution after taking power, that is wrong and it must be stopped. For the moment, that is before that state, so anything can be bearable.