Texas laws on minimum bow weight haven't always been this way. Until a couple years ago there was a minimum of 40#. The minimum # law was changed about the same time squirrels and rabbits were changed to game animals. That made hunting them with an airgun illegal. I'm still trying to figure that one out. You can't hunt squirrels and rabbits with a 1200fps scoped air rifle, but you can hunt them with a 15# bow.
I don't have problem with light bows if a person can shoot accurately. One of my longbows is 37# and I can kill with it. The problem I'm seeing is too many people are not proficient. They buy a light bow, then they bring it out of storage about a month before hunting season when they get hunting fever. Many can't hit a pie plate at 15 yards. Too many dads are taking their kids to the woods with 25# bows. There is a point that a bow becomes too light. That's is a recipe for wounded animals.