We can beat up abusers,
This is the only way to do it. Many of them are arrested and get light sentences. Rav Shtarkman’s 1000-pound beis din is the only deterrent to abusers.
we can beat up those who who dont pay taxes or pay their workers off the books
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WRONG! We are not allowed to act as enforcement agents for non beis din related crimes and we certainly cannot act as vigilantes for the government. Nonpayment of Jewish workers – yes, we should act. Anything else – that’s the government’s business and we who are straight pay taxes for government enforcement agencies that are supposed to weed out those who are not. Mesira is ossur lemehadrin in most cases. Abuse is one case where it is not, and so too might be reporting an investment scheme with Jewish victims. Otherwise, the only type of financial crime I would even ask a shyla about, is if I myself had to go to a consumer protection agency to get recourse against a frum seller for an item where beis din costs would be more than its value.
If anything, we should have lynched some members of the US government for letting Jews perish during the churban rather than allowing them into the US. That was the one thing the radical tzioinim did right (to the British) during the war.