There is no such thing as a “slippery slope” philosophically so all those using that argument should take a philosophy class. And yes there are things we can do to stop gun violence. Those using that argument are the same as those who throw up their hands at adolescent poor behavior and say “what can you do, kids do what they want to.” In both cases, instead of being a lazy parent or citizen; educate yourselves, read books and articles and be proactive. Start by strong stance to limit unwanted behavior.