Maybe I’m looking at it wrong but it doesn’t look like the bend is the worst issue you have there. For the bend, the pipe wrench idea is a good one if you can warm it up good (not cherry, but hot) and pull it back. If you leave it bolted together, it’s going to take a lot of force to cold bend it with steady pressure. To cold bend I'd probably chock it against something that isn’t going to move (like a good size tree), then bump it back with a sledge (thinking of my old 16 pounder; don’t think the 8 lb would do it) hitting it just hard enough to move it so as not tear any welds or rip the deck where it’s welded to the hitch mount. If you bum up the bolt doing that and ever need to remove it you might be removing it with an angle grinder but I wouldn’t think that would be a big deal.
Speaking of tearing welds, when I first looked at the pics I was kind of surprised it bent that far without tearing the deck or busting a weld at least a little. Then I zoomed in…
Straight side…
View attachment 103321
Bent side…
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Looks like you have a pretty good tear in the deck there beside where the hitch mount attaches to the deck on the side toward the center. If it is torn there, straightening the hitch is only one step in the repair as that tear is almost certain to get worse when you straighten it and most likely will continue to get worse with use.
If you don’t weld, I’d suggest get it fixed by someone who does. A decent welder/fabricator should be able to warm up the hitch, bend it back, and mend the tear in the deck pretty easily.
If I’m misinterpreting the pics, I’d chock it against a tree and slowly bend it back with large sledge. If you don’t have a 16lb to 20lb hammer it’s not a bad investment. Every now and then it’s handy to have an “It’s your own fault, I done told you to move” hammer.