Trump advocating for this, is a negative approach in politics. Instead of, for instance, promising jobs, bolstering the economy, (which are both positive), this approach takes into account the fear, pain and anger of people.

If elected, then we can say with some generally accepted consensus that "the people voted for it".

We are trying to judge the moral acceptability of imposing death penalty on arbitrary items, such as the ones you mentioned above. But it really is a matter that falls on the shoulder of any leadership.

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22 “What shall I do, then, with Jesus who is called the Messiah?” Pilate asked.

They all answered, “Crucify him!”