Agree here, but I'd also be in favor of some method of requiring gun owners to undergo this kind of course as well. While accidents are a small fraction of total gun deaths [1], they seem especially preventable by creating a well-regulated militia[2] and ensuring that armed citizens are required to at least be trained in the proper storage of their weapons.

[1] https://fivethirtyeight.com/features/gun-deaths/ [2] I'm not sure I agree with the interpretation that the "militia" in the second amendment consists of potentially all citizens, but IANAL and SCOTUS seems to disagree, so ¯\_(ツ)_/¯