Depends on the version. The later "Super Cubs" have a pretty good load capacity. However, all of them are made for two persons, so with a pilot only, the bomb could weigh as much as a person. That could hurt.
Actually, general aviation has been restricted for 20 or more years. Back when I was flying a Cessna 140, they started the "upside-down wedding cake" no-fly zones around a large percentage of airports in the US. I had to start going WAY out of my way to avoid flying illegally.
Anyone recall a couple of real whizzes back in the 60s who bombed a building at the UW-Madison, killing someone inside? They also reportedly flew in a light aircraft over the now-closed Badger Army Ammunition facility near Baraboo, armed as I recall with a small bomb that they intended to drop on said plant.
With idjuts like these it's not necessarily the size of their devices but the result of their vicious, maniacal act(s).
(Now ducking for the "size of their devices" set-up for y'all.....)
They are if you load them up with C4
Err, you mean Class B airspace? That's hardly a "no-fly zone," certainly not on the same order as the Presidential TFR.
Let's see how much people who defend this, complain when ground vehicle traffic is shut down for a Presidential motorcade, hmm?