In the United States, among TNR advocates, Australia and New Zealand are known as places with some of the most viciously hard-core anti-cat policies in the world. I heard within the last year that researchers in Australia are trying to engineer some kind of biological plague that would wipe out all the outdoor cats on the continent. I will refrain from stating explicitly what I think should be done to people who are plotting such actions, but suffice it to say that it is thoroughly medieval. I think they should be stopped by any means necessary.
Over here, there is a small group of scientists who publish the same studies year after year about how many wild animals cats kill, and every year the figures get inflated a bit more, to the point where some scientists have stated that if cats killed as many birds as these researchers claim, the species would be long extinct. The groups behind these anti-cat smear campaigns are The American Bird Conservancy, The Audobon Society, and the one other wildlife group. They use anti-cat hysteria and junk science for the purposes of publicity and fundraising. In the end, we know that habitat destruction is what wiped out the passenger pigeon and what continues to wipe out endangered species, but it's easier for these groups to scapegoat cats to call attention to the problem rather than point the finger at the real culprits: humans.
Opposed to them are groups like Alley Cat Allies and the blog Vox Felina. TNR has been legalized where I live, but other states like Florida seem to have lots of wildlife management officials under the anti-cat influence.
This is a highly contentious topic, and that's just the tip of the iceberg. Scandals among the anti-cat researchers include a woman hired by the Smithsonian who was convicted of going out at night and poisoning cats in her neighborhood. Can anyone imagine that such a person would be scientifically objective? It's unfortunate, but biofraud is very easy to perpetrate in these cases where there is no one to supervise data collection.