Well, riotting is violence, and I would accept the arguement that antiterrorism division would be a overreaction at first if this was the first night or two or maybe even third time it happened. I question where is the line?

This rioting has been going for some time. Granted off and on, but setting fire to a store is a a significant step up, from the previous just smashing and looting.

Also, yes sending in the marines as front line is overkill (and probably 99% illegal) bringing in the FBI is not "military action" though, in fact it would probably be better to do it now, than too risk having to use the military if things escalated further.

No offense, but if this was Nazi's, KKK, or some other originization that had some bad history with the US, it would be a different story. I mean across the nation we have officers suffering from vision loss, due to lasers. IED from fireworks combined with shrapnel, police station set a fire, another wendys set on fire also. This may be just one incident, but it is clearly being used as a political weapon to try and force nondemocratic change.

So I ask you, where is the line for domestic terrorism?

Also side note: remember how people lost there shit over the torches being out in march, out in the Carolinas. This shows actual action, full on violence, but some people were way more concerned and even calling that terrorism, but this is just "protesting". So again where is that line?