Look, I agree with their sentiment and want to commend them for using their platform for advocating an end to this genocide. The US should absolutely not be considering it in granting visas.
But, yeah, maybe don't do a chant calling for death to another country's military. Don't make it so easy for them. Make them ban you for simply saying "free Palestine". Don't let them say it's because you made threats of violence. Bring the majority with you, don't push them away.
You're gonna compare chants at a festival to MLK? Come on.