I don't believe they should be expected to remain silent Chagos. We don't have to listen to them, but they are certainly entitled to hold and share their political views. I can be a fan of someones musical talents but I'm not a disciple, I don't have to agree with everything they say.
Tastes can't be argued, really.
Well, I suppose they can but it's pretty pointless. With me it's not so much a matter of whether I agree or disagree with whatever is presented politically, what bugs me is when those having acquired prominence thru the talent they showed, start bugging their followers with aspirations of wanting to be political activists.
It cheapens whatever cause IMO and, what's more, it cheapens those that are truly active in said cause, often dealing with related hardships entailed in the process.
I'd concede exceptions but Waters is not one. Let him live among both Israelis and Palestinians for say a year and maybe we can talk. But with AFAIK just one brief trip to Israel, his "activism" is somewhat reminiscent of a de luxe poodle pissing on the expensive Persian carpet in the manor.
I'd advise him to stick to self-therapizing his childhood neuroses thru his lyrics. He was good at that and much of it I liked.
And to get back OT, the actual message has to date still not been presented. My rants (previous and this one) occurred mainly to exemplify why the intended message was soured to the point of not even being read.
David Gilmour actually combined message with music in the following (if you're not too young for it

) far more effectively. A cry from the heart that could hardly be written, composed and played any better.
I've chosen a "non video" version so there be no distraction by light effects, let those who don't already know it close their eyes and listen, especially to the guitar that begins its howling lament at around 4:30 mins.
Lyrics