Polarization knows many victims. Important drivers are outrage, othering and dismissal.
I've followed Project Veritas and yes they go undercover for right-wing causes, but I haven't seen evidence of them being deliberately untruthful in their reporting.
The real case here is that imho we should all start to (1) withdraw from outrage, (2) expand our bubble to cover all sides.
I've done the latter, it helped with the former, although I'm not there yet.