Yes, and they shouldn't be.

> The idea that some out of the way and moderately interesting art is a priority is laughable.

I don't think it's that interesting, but besides that I don't follow your rationale. Because some people litter against the rules, we shouldn't clean up this thing someone put on federal lands? Even so, wouldn't large pieces of litter take priority over smaller ones simply due to human nature?

I really feel like you're stretching here. Frankly, it's interesting to watch people defend some thing they just found out about and have no attachment to.