I think they've since made up and gotten back together, but I could be wrong. I think it was a number of things. Including, but not limited to:
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Trump supporters have guns, and in his eyes that could have put a target on his own back (having said that, they were touring Australia at the time. No one has guns there, and cancelling your tour on a bunch of fans that paid and had set time aside to see them is shitty to them)
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He has a lucrative Hollywood career and doesn't want to lose work over an "extreme" view like that
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Maybe he was worried about being labeled a terrorist by Trump if he got elected.
I have the feeling it was mainly #2 though.
I keep saying this. In 2 months all this antitrust stuff goes out the window. If people actually bothered to show up on 11/5 Kahn and co could actually get some wins for the American people. Instead, we're going to get more monopolies shoved down our throats.