This is a really interesting thread and I'm not sure where I stand - I think it's because we're actually arguing multiple points not just one. I've tried to separate them in my head ...
Is what Israel is doing in Gaza terrible?
Yes
Is Israel/Palestine a complicated conflict that's been ongoing for at least 70 years with atrocities on both sides?
Also yes
Is it anti-semitic to talk about the atrocities in Gaza?
No
Are some people (not all) sliding into anti-Jewish sentiment when talking about Gaza?
Yes
Should performers be expected/forced to take a side on political issues?
No
Should performers be allowed to talk about political issues if they want to?
Yes
Should performers be allowed to talk about political issues if they are a much smaller support act for a non-political artist?
Hmm not sure ... I'd say yes but they should perhaps be a bit sensitive to the wider context
Should a venue owner be able to censor an artist because they disagree with them? (I'm not thinking of Gaza specifically here but more generally - say they were talking about immigration or the trans issue etc etc)
Interesting one ... I'd say No because I strongly believe in free speech ... but I guess if the owner has a genuine belief that what the person is saying is wrong, might they feel they have a duty to act?
Should Ed have supported Macklemore as far as possible and tried to prevent him being taken off the bill?
Yes
If it was non-negotiable and Macklemore was not going to be allowed to perform whatever Ed did, should Ed have cancelled the concerts completely?
Well that's a lot more difficult - we don't want people to be complicit in blocking free speech - but it would have been a big ask for Ed to expect everyone invoved in the concerts to lose all that money, probably be in breach of contract, and disappoint thousands and thousands of fans ... it would also imply he was agreeing with Macklemore on the Israel/Palestine conflict when he's clearly said he doesn't want to publicly take a side
So overall I'd say it's a complex situation, I do strongly believe in free speech but I also think it's too simplistic to just blame Ed.