His father is all he has left of their family of five.  He was in the car when his mother and sister were killed.  He saw his remaining brother taken by cancer. Out of his entire family, all he has left is his father. Going after someone like this so relentlessly simply for having a troubled life is one of the most evil things I've ever seen perpetrated by an American politician.  He has no solid proof of any kind of corruption, but even if Trump's allegations were true, he has surpassed by far the level of corruption and what he says Hunter Biden did in both quantity and severity.  What's really sick and corrupt is the way Trump is attacking Joe Biden through his troubled child.  

I really think Trump has no low bar. If something could potentially work as a means to an end, regardless of the harm and pain it could cause, Trump would never hesitate. You certainly can't accuse him of lacking that Killer Instinct.