Pattern of behavior. Joe Biden has publicly expressed his sympathies on various topics. I could be cynical and say that these speeches are written for him. So what if they are? That doesn't mean he doesn't share those sentiments. It doesn't mean the feeling isn't there.
With Trump, you'd get at most "What a shame." As if someone had befallen bad luck, but they would recover as if it was a game of cards. I mean, Trump has shown passion before but in a way that uses anger and hateful rhetoric.
Hateful rhetoric is why the streams are divided.