Trump is advocating self defense (if they have a tomato, ...).
And folks want to hear a leader who is willing to advocate self defense.
Which we need, against terrorists, border jumpers, looters, etc.
"One ought never to turn one's back on a threatened danger and try to run away from it. If you do that, you will double the danger. But if you meet it promptly and without flinching, you will reduce the danger by half."
Sir Winston Churchill........