My neighbors GMC Denali parked illegally in front of a stop sign and crosswalk, next to my other neighbors Mazda Miata
This is not out in some rural town. This is in Portland, OR about 2 miles from downtown. Personal vehicles this large are simply incompatible with urban living and pressure their owners to continually break traffic law. Technically that Miata is parked as close to the stop sign as it can legally be, but as the Denali doesn't fit in many places around here it's owner is compelled to park across both the stop sign and the crosswalk.
Follow up: To whatever bootlicking idiot called PBOT and asked for enforcement on this block, it didn't help. It made things worse just like I cautioned such actions do in the discussion below. They didn't ticket the truck (Which was indeed parking in front of the stop sign this morning) but they did ticket just about every-other car parked on this street for non-street safety related things like parked wrong orientation, literal broken window, expired registration, etc. You probably cost my neighbors a few thousand dollars in combined citations for minor procedural issues, now everybody is miserable and the truck is still parked there. Please, never ever do that again. Your fantasy of calling law enforcement to fix all the problems is not what happens in real life. It doesn't matter who they are, NEVER CALL THE COPS ON YOUR NEIGHBORS.
Not as effective but an easy temp fix is to put a small rock under the cap and screw it back on. Most effective if two tires are done so they can't just swap a spare, not that this chud knows how to change a tire or has a 5' tall jack to lift the truck 6" to do the work.
Assuming they're just regular schrader valves, you don't need a special tool. You can even just use a pencil or ballpoint if you just want to let out the air. It's less risky for you than taking out the valve.