Maybe he was tired of people leaving early and making him look bad.
What surprises me is that they’re surprised. What’s more Trump than pretending you care about people for a couple of minutes to try and get their votes and then strand them and assume they’ll still vote for you, which they probably will?
Trump’s Coachella Rally Went About as Well as You’d Expect | The New Republic:
https://newrepublic.com/post/187126/donald-trump-fans-coachella-rally-stranded