Question: If Voight's a dirty cop and everyone knows it why tolerate it? Why not set up a sting and take him down?
Answer: Also, if you watch Season 1 of Chicago Fire it gives a little history of Voight before he goes to jail when he was actually a "dirty cop" and Antonio Dawson is actually the one who takes him down. I found it interesting and was surprised by his character back then.
Answer: And cuz he's only dirty to the bad guys. He takes care of the victims.
Question: How does Bakula afford that bar he owns? Do Feds really make enough to make such purchases?
Answer: It should also be noted, just because someone owns a small business (in this case a bar) doesn't mean they're rich, or they had to be rich or make enough money from another job in order to afford it. Banks provide small business loans and having steady employment, good credit history, solid business plan, etc would allow someone to get a loan. Most business owners even say they "own" whatever bar, restaurant, store, or business they run even if it's leased or mortgaged.
Question: How is it that Butch doesn't get his hand back but Galavan's sister has full control over hers even though it was sliced off?
Answer: Tabitha got her hand sewn back on, Butch didn't.
Answer: Because he is a great cop and gets the job done better than anyone.