I don't believe Biden has any empathy for anyone outside his immediate family and circle of friends. The victims of his policies mean nothing to him or his regime. As for PR, the last thing he wants is to draw attention to dead Americans as a direct result of his policies. What can he say? Thanks for your daughter's sacrifice for my mass immigration goals? He certainly wouldn't apologize.
It was the same with Obama. When that Muslim in the US Army massacred people at Ft. Hood, Obama didn’t go—he was just concerned that the incident might cause anti-Muslim sentiment. But former President George W. Bush went to Fort Hood on his own to meet with the survivors of the attack. For all his shortcomings in office, GWB had genuine empathy in cases like that.