

I don’t even think “owning the libs” is the primary goal for them. The republicans and libertarians despise public institutions. They want everything to be privatized. They cannot stand that an oligarch is not profiting from the service the USPS provides.
They are constantly trying to undermine the USPS to make it struggle so they can point and say, "Look! Look! See! Government services are bad! We must cut this wasteful spending and outsource mail delivery to Amazon Mail™ "
It probably helps that they are targeting decent, normal working immigrants, who are unlikely to be armed.
If they were actually going after armed gang members, they probably would be getting shot. But as we can tell by the fact they are hiding their faces, they are chicken shit losers cosplaying as tough guys targeting defenseless people because it’s easier.