Interpreting the Constitution is tantamount to altering it.
No. Interpreting the Constitution, or any law, is the only way to make it function. I've been over this with you dozens of times, but you seem to be determined to confuse simple interpretation with judicial activism. Interpretation is essential any time a court is faced with a particular set of facts.
--A says in public that B is a rat who stole his own grandmother's savings account. Is that defamation, or is it protected expression under the First?
--O hears someone laughing, smells incense and kicks down A's door. O finds A smoking pot and arrests him. Was the entry legal under the Constitution?
--President signs an executive order instructing the legislature of Alaska to sign off on a new law mandating civil defense measures. Constitutional?
--Alaska puts a head tax on every entering tourist. Constitutional?
--Oregon puts a tax on all incoming produce from California. Constitutional?
--Federal agency passes rules restricting the use of curse words on television. Constitutional?
To answer these or a million other fact patterns, you must interpret the Constitution. You yourself are interpreting the Constitution in this thread by deciding that the Second protects anything that can be defined as a weapon.
That's a very broad interpretation, but contrary to your faith it is not the only one.
When plain English becomes twisted back upon itself until it is claimed to mean the opposite of what it obviously does, then we end up with things meaning nothing.
True enough, but what I'm trying to explain is that an expansive reading of "arms" actually SUPPORTS the twisted group rights interpretation of the Second. "Arms" must be read in context or it becomes letters on a page.