You been around infantry guys much lately?
Our troops wouldn't be aware that the search warrant was to seize all the arms in town and round up all gun owners, ala Concord and Lexington. That would not be part of their pre-mission briefing. All they would be told is some group attacked the police, and the National Command Authority had determined that military intervention was warranted.
And our troops would go and complete that mission. That is just the way it is.
I've been around a XO of a MEU, a couple of platoon leaders and some NCOs in the Marines. They'll follow lawful orders and the only non infantry guy was a Colonel In the USAF. Who knows what someone would do in the heat of the moment.