Why is everyone accepting the unstated assumption: that a child's actions (if the dubious allegations were true) should reflect on the parent? Corruption of bl

Why is everyone accepting the unstated assumption: that a child's actions (if the dubious allegations were true) should reflect on the parent? Corruption of blood is even prohibited by the Constitution and for good reason. Eve if Hunter Biden did something wrong that doesn't really have anything to do with Joe Biden. There also isn't even a tiny hint that Joe Biden's position on Russia vs Ukraine has changed at any point. Is Trump liable for everything his kids say and do? Or the obvious influence peddling they're doing right now? The whole premise of this is to smear someone by familial association. So in that light it's garbage from the start. In my mind the connection to Giuliani makes it even more likely to be entirely fabricated, but taken at face value it's a worthless conspiracy theory story clearly dropped at the last minute to attempt to sway the election.