ISPs are not natural monopolies though. In the US they are self-made monopolies that over the years pushed for enough regulations to completely thwart competition. Compare that with the most competing ISP markets, like Romania, Ukraine, Russia, where most people can choose from a few ISPs and up to 10+ in densely populated areas.

So, net neutrality is an attempt to fix regulation problem with more regulations. Which obviously cannot work for long, they are too big and have too much influence to push regulations that benefit them. At some point this could cause enough problems to become a political thing and new people in power would be forced to actually take action against them.