Hunter may or may not be a criminal. But he's not been charged/convicted of anything, so in this case your opinion is about as worthwhile as shit flavoured lollipop. I can say Donald Trump is a criminal IMO, but it doesn't make it so in reality.
As for Hunter, we know he is an addict. Did he earn everything he got? Probably not. That's a theme with nepotism. Look at the Trump kids...The point is, and I'm going to say it again and again - We don't know what happened with this incident. Could Hunter be arrested for having crack? Pot? LSD? Did Joe do anything to influence the case? Or did a good attorney take care of things? In many ways, this is more of a thing about privilege than political interference. But, as I've said, there are no details on this 35 year old case. So, in a vacuum you are filling in what you *think* happened (or maybe wish happened to you can slam Joe). Now, again, I'm not denying there is a chance that Joe did something to mitigate the charges, it is entirely possible.
Now, as for Joe enabling him...how? I mean, he tried to get him help. Hunter has issues. But the better question here is what parent wouldn't do anything they could to help their kids? If I had any, you can bet your sweet ass I would do whatever I could to help them out of a jam. And love them even when they fuck up.