I'm not sure I understand your objection. How does being legally armed equal intent to not be peaceable? I went to church this morning. I was armed (as I always am). How did my being armed equal the intent to not be peaceful?
The Klan is, in my opinion, one of the most despicable organizations in the country. But in a free country they have the same constitutional rights as everyone else. And that includes the right to peaceable assembly.
If only some people have it, it is not freedom. It is tyranny.
Supporting that concept is not supporting the Klan. It is supporting the Constitution.
I wasn't making a gun rights statement I was simply saying that those people went expecting and maybe even hoping for a fight. And got one.