Ah yes the famous "let's blow up our own building in the middle of a terrorist attack because funny. And before you say "it's not a terrorist attack", Google the term. "Terrorism, in its broadest sense, is the use of intentional violence and fear to achieve political or ideological aims. The term is used in this regard primarily to refer to intentional violence during peacetime or in the context of war against non-combatants."
They came armed with bear spray, flagpoles, stun guns, baseball bats, unnamed chemicals, and someone planted pipe bombs by the Democratic and Republican headquarters. Doesn't sound like "unarmed people merely walking into a building"