Why Did They Kill Her?

The Capitol Police chased down and KILLED a disturbed young woman who rammed one of their cars and ran. Why? Why did they aim their guns at this WOMAN? She had no guns. All she had was a 2,000 pound missile that was of no use to her if they shot out her tires or disabled her engine. Why did they have to KILL her, and right in the presence of her small CHILDREN? Are they “trigger-happy?” I have nothing against cops doing their duty, but this seems to be EXCESSIVE. Couldn’t they have stopped her in any other way? they SAY they didn't know if she had explosives, but terrorists rarely bring their children along when they blow things up. Did they HAVE TO make her two children orphans? (American Thinker)