If there is a direct call to action then they should be held responsible, but like I said I don't know what the context is or what was said in the Belfast situation.

The words the Nazis said were irrelevant. They directed people to kill and as such they were guilty.

I think someone who goes and attacks somebody is guilty. They cannot use the excuse they were following orders. The words didn't take control of them like a spell. They made the conscious choice to commit violence and as such the guilt is on them, not the bat.