I think considering the size aspect of this "Argument" at least if they got a banded cat shark or coral shark, exc.. sharks that top out about 3ft at max at least it would have a better chance of living in a tank closer to happy then a nurse shark that gets MASSIVE (im talking 14 FEET) and living in the same size tank as the cat sharks, at least the torture of living in a 100 gallon tank, 55 gallon tank, 20 gallon tank that some people try to get away with for "a year" would be less torturous then trying to put a nurse shark that are usually sold about a foot long in the same size tanks.
I also think if anyone released that shark into the wild would be pretty irresponsible and cold hearted, depending on where you live they arent even capable of living, releasing nurse shark in northern states for example, where the water is too cold. There are plenty of alternatives, donating to local aquariums, LFS that have large displays, exc. Again, if you cant at least think that far in advance you have no business having it in the first place.
Instead of giving people ideas by stating "hey if you gonna have any kind of shark, have this one that gets HUGE" Tell them the brutal honest truth that most sharks die in the first few months with inexperienced owners, many get FAR TOO LARGE for the tanks people are keeping them in, they are messy eaters, cause headaches for water quality, lower the number of fish you can have in your tank, exc. maybe fewer people would be as eager to get them in the first place. I would love to see how many people actually live on a coast on this forum anyway... "Releasing them in the wild" wouldnt be an option in those instances... i doubt someone is going to personally kill their own pet because it got too big either.. perhaps im being naive.