Washington DC becoming troop city

The attack on two National Guardsmen in the heart of Washington DC was horrendous and inexplicable. Why would an Afghan who had served with a CIA-backed unit in Afghanistan feel the need to drive across the US from his home state, Washington, to try and assassinate soldiers in the capital just doing their job? It makes no sense. But the alleged guilty man, now critically injured, like his two victims, must have some twisted view about having soldiers on the streets. But what seems a bit strange is that Pete Hegseth, the US defence secretary, has reacted by sending 500 more National Guardsmen into the capital. Deploying troops on the streets in any city was a dubious decision in the first place, and the sight of hundreds of soldiers in uniform patrolling Washington never looked right. There are so many different police forces in the capital already, one wonders why they aren't all tripping over each other. Sending another 500 seems to me to be a gut reaction which will just make everyone think of Washington as a dangerous city. Which it isn't. This was, hopefully, a one-off shooting committed by someone with serious mental health problems. It doesn't really justify pouring more troops into the capital.