I used to think this as well until I started to think in terms of speciation and territorialism.
While, yes, they are virtue signalling, all groups virtue signal their groups value systems. However, that isn't the REAL purpose of those stickers. The REAL purpose is signalling to other groups. Those stickers signal your active presence and act as defacto territorial claims. In addition, they signal aggressiveness because most people would just rather duck and hide and not have to confront people so anyone willing to LOUDLY proclaim group allegiance (the flag) and make proclamations about values around that is signalling a claim to territory and an aggressive posture merely by the existence of the owner of those stickers.
Advertising works, it's not as pointless as it seems.
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