This is so obviously a blatant attempt to take Mr Trump out of the presidential running. And it is a sad day for our nation, considering that others, including Mr Biden, have been caught with classified documents in their possession.
The false equivalency has really taken root. There's zero in common between the two cases, and yet it's such a convenient excuse for right-wingers to fall back on when they're challenged on their support for Trump.
There's that, absolutely, but I also think a lot of folks making the argument that Biden did it too don't actually believe the argument — it's just empty words they can use to shift the argument away from Trump.