I think the real danger is laws such as this one in Washington is the very vagueness of what is really meant as a transfer. This opens us up for very punitive and selective enforcement of the law. We all know how politicized the criminal justice system has become. I could well see a "good shooting" where someone acted in self defense but the activists could care less about that and are out for blood. When all else fails the prosecutor might find someone to say "yes, the accused loaned me a gun to use at the range" or something similar and at least then the prosecutor can claim to be going after the "bad guy". Maybe you write a letter to the editor and complain about the local mayor, or governor, or district attorney and the next thing you know investigators put the cuffs on you when they see you let your nephew or niece fire your gun at a public shooting range.
I fear that most citizens today are pretty stupid, and I KNOW that they are ignorant. They are willing, apparently to give up freedom in return for what they think is security, and they end up with neither. When these laws do not magically eliminate violent crime in the State of Washington, just watch the anti-gun, Bloomberg funded activists start demanding more and more "common sense" gun laws.