1. "ban on Muslim immigrants"
"...until we find out what the heck is going on"
2. "illegal Mexican immigrants are criminals and rapists"
"When Mexico sends its people, they’re not sending their best. .... And some, I assume, are good people."
3. I won't even touch the "assassination" thing.
"...until we find out what the heck is going on" doesn't help. Hate doesn't stop being hateful when you say it's temporary, and neither does blatantly violating the Constitution become OK.
"And some, I assume, are good people." This immediately follows "They’re rapists." So, what does it mean? Some of the rapists are good people? Or he meant to say that some of them are rapists? Even there, "some" implies not huge amount, so "some are good people" implies most of them aren't. So, OK, he only called most illegal Mexican immigrants rapists, that's not much better.
Finally, let me guess, you believe his followup damage control that "second amendment people" meant their superior abilities at political organization?
“If she gets to pick her judges, nothing you can do, folks,” Mr. Trump said, as the crowd began to boo. He quickly added: “Although the Second Amendment people — maybe there is, I don’t know.”
How is that not an allusion to assassination? He is talking about a situation in which Hillary has won and appointed a judge. How else do people suspect "second amendment people" are going to stop her at that point?