I've figured out! Based on the pentagram over the garage, this house is the hideout for a cult that's planning on using the civil defense sirens to summon the apocalypse or some other weird occult stuff. If that's the case, then the irony isn't lost on me. These are doomsday whistles in every sense.
They likely make sacrifices to the Thunderbolt and 2T22 to appease some entity. My guess is that they've sacrificed many an ACA Allertor and more than a few Sentry 16V1T-Bs, 20V2Ts and 40V2Ts. The latter is because they've displeased the 2T22 by looking a bit like it, but having a really buzzy sound.
I found a clip from this guy's neighbourhood after he fired up the Fed Sig Model 2 that he used to have. The Thunderbolt's a lot fiercer so, I'd imagine that the neighbours' reaction was either greater panic or going over to his house with torches and pitchforks.
This guy is also likely buddies with whoever owns that house:
It looks like a new species of whacker has been discovered!! Jarred J must be informed ASAP!