McCain isn't a nice guy. He's always been opposed to every kind of civil rights and in favor of total central government power and total war.
He introduced the campaign finance bill that forced the government to argue before the Supreme Court that it had the power to ban books with political opinions it didn't agree with, the same argument that led to the Citizens United decision.
He made up a song about bombing Iran and sang it at campaign stops. (Tune of Beach Boys' Barbara Ann)
That's just the start. This encryption but is of a piece with his whole career. McCain is as bad as they come.