Except "it was made after the constitution was written" is a standard you've made up -- there is existing case law from SCOTUS that 2A protects guns "in common use"

Actually things that are new after the constitution was written is regularly brought up before the court it’s a very common argument. The thing was written a long time ago, everyone involved in the process acknowledges that fact. The degree to which papers applies to electronic data should be familiar to you.

Supreme court rulings are arbitrary as they regularly reverse or update standards, sometimes multiple times.

Yes, if your argument is found to be right in the future, then it will be right. Currently it is not, and it is unlikely to be any different until the composition of the court changes. Until then, the only other path to change it is an amendment.

I agree it’s the composition of the Supreme Court that’s at issue not the constitution.

Saying what arguments are right doesn’t make sense in these contexts only what is the current precedent.

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