Arms can get bent in a variety of ways, but the most common is trying to push heavy wet snow off without using a scraper first.
Take the arm off of the Jeep and "GENTLY" bend it back into shape. It shouldn't have any bend in it, since we have a flat windshield surface. If the arm is straight, your tension spring is worn and not holding enough tension on the arm, which will not keep the blade down on the windshield surface.
In all honesty, it may be easier to just replace the wiper arm, or swap it over to the passenger side to make sure that it is truly the problem. My son always tells me that seeing what is going to crash into us isn't as important for the passenger anyway