Because the COLD BLOODED KILLER IS BLACK!!!!
There’s a common law rendering automatic killing contraptions in one’s home that visit death on unwary breaker-and-enterers when one is absent from the home illegal. They were determined to be too devaluing of human life (yes, even of the misguided lives of ordinary “burgurglers” as Rush used to say). The trigger-happy shooter in this case was lingering out of sight and in a cowardly wsy near that entry point just waiting to pick off for the sin of poppping their head in. The first person to do so was facing an unexpected death penalty from this unnamed shooter. Nobody in D.C. that day could have been expecting such brutality unless they were planning for it to happen for political purposes.