Of course, I don’t feel comfortable actively dissuading the students from going (they get enough pressure from parents and other staff at the school), but sometimes I wonder if I should.
It might be worth just mentioning about your perspective on the racism issue, but you're right to avoid adding pressure.
I think it's reductive to say that it's "pseudo-random brush strokes". There's a bizarre level of sophistication and regularity to Jackson Pollock when analyzed mathematically.
That doesn't mean I enjoy Pollock's art, as I absolutely do not, but some other expressionism is more fun if you look into it.