You can absolutely vote out the politicians responsible for for giving authority to these regulators. In fact, it's your duty to vote out crooked politicians. Even when both candidates for an office are crooked, they won't be equally crooked. Figure out which will do the least damage and support that candidate despite their flaws.
And don't give up hope. Crooked interests are absolutely counting on voters' cynicism to allow them to operate.
And don't give up hope. Crooked interests are absolutely counting on voters' cynicism to allow them to operate.