Biden's son had committed and was convicted of a petty crime that is basically never enforced.

The pardon was sweeping.

You seem to be arguing semantics. I care about what his son actually did. If someone is sitting in jail for a marijuana conviction, and gets a blanket pardon, I am going to say they were pardoned for the marijuana conviction, not for some theorized other crime.

Biden issued sweeping pardons to expected targets of Trump's anticipated (and fairly explicitly signalled) partisan weaponization of DoJ, which is an effective and costly political punishment even if it never secured a conviction, but so long as a suitable pretext can be found.

As we now see that being executed after mass partisan purges and, in several cases (sone where this is already adjudicated, more where it is pending) illegal appointments because that was the only way yo get or keep willing hacks in position to carry out the prosecutions, its arguable the only thing Biden did wrong in that regard was not doing it widely enough.