Jacuzzi isn't h4x, he's just ridiculously determined when he's not blubbering like a little girl.
Graham, on the other hand, can smash concrete with a giant wrench, throw around cars while disassembling them, and probably most ridiculous of all, catch and reflect bullets using a spanner.
Ladd, despite using a gun most of the time and having little need for the powers to begin with, is apparently strong and fast enough to catch Graham's spanner attacks, as well as being able to punch down a water tower, though as mentioned earlier, not without his arm disintegrating into a bloody stump.
And then after all that, you have Rail Tracer, who's just fucking ridiculous.
All in all, it seems like in the Baccano universe, being a fucking psycho gives you super strength.