I myself do not tether my dogs not because I think it is inhumane but for the simple reason I do not have the yard space to do so. I do have to crate my dogs when I am not here which is widely accepted as a form of confinement for "responsible" owners, yet putting them out tethered conjures up images of terrible owners who neglect their dogs. While this may be true in many situations its not always the case and that is all I am trying to point out. Anti-Tethering laws ultimately affect even responsible owners just like BSL.
The laws we currently have in place people can't follow now and somehow people think enacting new laws will somehow make the problem magically disappear. Many "Animal Rights" organizations are also pushing for these laws and some of these same organizations would love to see the breed eradicated as a whole. Organizations who have publically stated that humans should not have companion animals yet people align themselves with them on bills like anti tethering?
In closing I don't think new laws are the answer to the problem, but harsher penalties for the people who break the laws we already have in place, once again just my opinion.