How do you figure? I agree it's not a good argument for banning guns, but this is exactly the kind of situation that makes people uncomfortable about the almost total lack of restrictions around gun ownership. These parents bought a gun, legally, and thought that their son would be able to handle it safely and responsibly so they gave it to him. They kept it out in the open, in a corner, and were obviously not careful enough to ensure that it was unloaded while they weren't around. It's a tragic accident, but the misjudgments and carelessness of this family left a lethal instrument in reach of a kid, and now an innocent person is dead. Do you think it's unreasonable to question this family's ability to manage something as dangerous as a gun in a safe and responsible manner? Or to be concerned about similar incidents?
Be *VERY* careful about that reasoning.
A very central tenant in US law is the castle doctrine. Basically "your home is your castle".
It is not codified in those words, but most existing laws fall under that doctrine. Quite a few SCOTUS rulings have cited it. Just one of many that Justia finds: "The maxim that 'every man's house is his castle' is made a part of our constitutional law ... and has always been looked upon as of high value to the citizen."
If they have already violated the law, if they are convicted of a felony that is not expunged, then yes their right to own firearms is restricted in the US.
They made a stupid choice within their home. But the choice is theirs to make.
Prior to becoming convicted of a felony their home is their castle. Their rights belong to them. Only after committing the felony and having demonstrated an inability to handle freedom is the freedom taken away for the good of society.
Please do not forget that in the United States we hold that all rights belong to the people, and only limited enumerated rights are granted to the government by the people. Sad history has proven that most governments forget this simple truth. Unfortunately governments (including our own) need to be frequently reminded that they are only stewards of the authority rather than the source.