These photos allow us to objectively observe some aspects of negative human behavior. IMHO, offending owners remain clueless and often repeat that behavior. Thus, they should receive feedback of this self-centered habit. At a minimum, they need a reminder - a note is appropriate, e.g. variations of the ones posted so far.
For more severe cases (YMMV), perhaps a 16 penny nail or an equivalent air-extraction strategy is called for. OTOH, a flat tire may be too subtle for these dullards to connect the dots. Include a note too.
More reasonable parking may not be realized, but repeated air loss could instead increase their level of paranoia. Call it even.
