It’s not. In the view of many, civilian gun ownership is A Problem To Be Solved. Such people do not draw a distinction between law-abiding gun owners who keep their guns secure and threaten nobody, and violent criminals and psychopaths who frequently kill people. Thus, with that view, any law that restricts gun ownership or reduces the number of guns in society is progress.
In reality, this law will do absolutely nothing for public safety. It will make the lives of gun owners harder, while the criminals and psychos will ignore this law just as they do every other law.