It's just pointing out that all political power in this world is ultimately held through the direct or indirect threat of violence. It's not a moral judgement but a fact of the world.
If my "politics" disagrees with those of the state, in that I don't believe people have a right to personal property, and that the police have no right to arrest me, then ultimately what will happen is violence against me by the state.
Yes everyone could go around abiding the law all the time, and we could skip the Gordon riots, the suffragettes, the battle of Cable Street etc... . I'm glad that's not the world we live in and that people have the courage to follow through with their convictions against state oppression, with violence if need be.
I’m going to leave you with a quote from wikipedias page on Fascism:
“Fascism rejects the assertion that violence is automatically negative in nature and views imperialism, political violence and war as means that can achieve national rejuvenation”
I never mentioned what politics I agree with, nor can you infer in good faith that I'd celebrate the murder of Jo Cox. You're greatly over-generalising my argument in order to try and prove an absurd consequence.
Maybe an analogy would clarify. Let's suppose you didn't think speech was justified in politics. I would argue that political progress has very often come about because of speech. You cannot then infer that I support the content of every speech made by Tony Blair.
But you regard violence as legitimate and positive political tactic in some circumstances. So did Thomas Mair. I think that belief is problematic, and should not be encouraged. By making the connection between apparently acceptable-for-plaques political violence and the national-day-of-morning kind, I hope to draw attention to the fact that it’s fundamentally problematic.
Everyone believes they are the hero of their own story - including people who hold different political beliefs to our own. They are surely only following the moral code you outline when they stand up for their convictions and reach for the revolver or knife or suicide bomb vest?
The irony here is that acceptable political violence is a facist belief. Perhaps you should investigate facism further: you might find it agreeable. I hear they have the best T-shirts.
If my "politics" disagrees with those of the state, in that I don't believe people have a right to personal property, and that the police have no right to arrest me, then ultimately what will happen is violence against me by the state.