Because women aren't objects to play for and win like a prize in a claw machine. They're people who have thoughts and wants and desires and aren't interested in being treated like an object to be possessed while they're out having fun. If you walk up and you're obviously looking to find something to be romantically interested in, and they want to get to know people like people before anything romantic, you're not going to have any luck. Like a bunch of the other comments said, go find something that you enjoy doing and get to know the people there as humans. Talk about your shared interest, about your goals and wants and desires for your life outside of a romantic partner, and ask them about the same. Surprisingly, once you stop treating women like fresh meat on a savannah and actually try to get to know who they are as people, they stop being so freaked out and might actually be interested in getting to know you as a person.