Ferel and wild cats are a problem everywhere.
In Hawaii to help save the endemic (only found there) and indiginous birds, they have a program to feed, capture, and spay/neuter give shots etc to the wild cats and return them to their turf. (Also note, Hawaii is still rabies-free)
I really dont want to see the Wisconsin law go into effect. There are other ways to work on this problem. It takes local people who love and respect wildlife, including wild cats, to do the work. In Oregon there are several local groups who do the same thing.
My cats are indoor/outdoor. They will not keep on any type of humane collar I put on them. They are chipped and have their shots up to date including rabies. I understand indoor-only cats, but I cannot deny my cats their outdoor freedoms.