Big Mick, all those fighters you listed were fighting for causes for which there was no alternative but to fight.
They did not have the alternative of just persuading enough people to vote with them.

I respect McKenna's peaceful, self sacrificing protest.
I called him a terrorist because he was an IRA man.
A bomb in a shopping centre, bus station, etc. etc. that kills mums and children IS terrorism not politics.

I do not know if he did such things but, if so ordered, would he have a choice?
Did he ever speak against such things?