Generally a crooked front site still shot to point of aim. Is it just on the barrel crooked or canted as also called, or is it truly bent as you say?
Usually the crooked or canted front site as I stated still shoot to point of aim, so it is more of a looks thing. If you want to straighten out a crooked sight, you need to knock out the cross pins, realign the sight, then redrill the holes and usually you can reuse the original pins, but sometimes you need to install slightly larger diameter pins. Cutting the end of a drill bit to size that was used to redrill the holes can be used.
You might find that by straightening the site, you will have to adjust the sight pin and on some rifles I have seen them way off to one side to still get the rifle to shoot to point of aim.