A 2 inch dent can be read 2 ways. A dent that is 2 inches long in the downtube. A dent that drives the downtube to the side 2 inches. If it's a shallow dent in the downtube that is 2 inches long, I would say no biggeeee, but if the downtube is moved over 2 inches, that's an issue. I can see repairing it, myself, but paying to have it done would likely cost more than a frame costs. If the forks are really bent thers a cost, but sometimes they are just "Tweaked" & the triple tree clamps can be loosened & straighten them up & the handlebars are straight across again when the tire is pointed straight. To know when it's lined up, get a piece of light rope that doesnt stretch & mark a spot on the front tire, measure to the end of the handlebar, do the same thing on each side & adjust till you get them equal. A little tape on the rope helps & a spot on the tire to make sure you measure at the same place. Whiteout on the tire is good. I had to do this on the Guzzi when I dropped it, cuz it slapped hard enough to make the front tire point left.I wound up kicking the tire to get the thing to go back, Even with the clamp loose, it wouldnt just go back straight without"persuasion".  Good Luck.

I notice you arent talking about yourself being injured. Did you manage to get away without the person who mashed your bike hurting You, too? If so, Congratulations!! Real sad about the bike, but surely their insurance will be buying you another??

Study the frame for cracked paint at the welds above & below the bend. If cracked, it's bent more than you can see.