And just to help the Gab users: Click on the profile of the person you want to mute, and you will find the option there.

"I don't know why the government is standing by and letting this happen."

Neither do I, but I suspect part of it is Trump's isolation from social media engineered by his new Chief of Staff. He claims he didn't know about the Joe Arpaio case until he was convicted, and he saw it on TV. TV! That's really inexcusable.