It's quite interesting from a religious perspective. Most of these people pretend to be devout christians with christian principles, but they judge Joe Biden harshly for loving his son and for the fact he has forgiven him his many missteps.
If they were actually devout christians, they would realise the way Biden treats his son is quite reminiscent of the Parable of the Prodigal Son. It's been a while, but the whole point of that parable, is that just like a father forgives his wayward son, God forgives his children for our many missteps and sins, and celebrates our return to the fold as the father celebrated the return of his prodigal son.
I honestly don't know how you can hate Joe Biden for forgiving and loving his son, then expect God to forgive you for your sins.
Personally, I'm not religious. The interesting thing is that in practice, despite their loud prostestations and virtue signaling, the conservative right seem to be becoming increasingly secular too. I don't think many of them actually believe. They certainly don't seem to believe in Christian values or the bible anymore. They just hang on to the symbols of religion because it is politically expedient and allows them to differentiate their in-group, then often seem to do the exact opposite of what the bible tells them to do.