There is zero utilitarian value of arbitrary words on a shirt. The shirt will keep sun off your back and absorb your sweat just as well or as poorly with or without the words.

The ONLY point of the words is to express a sentiment shared by the group, creating a bond and solidarity.

But if the sentiment did not come from anyone in the group or from the group as a collective, why put words on the shirt at all?

It's the lie of a shared connection without the reality. Just like social media "friends" or the "intimacy" of porn. Just another way to destroy a little more of our souls.