If the rule stated "No student is permitted to have a left arm." Would you cut off your childs left arm and THEN fight the rule? I doubt it.
I know - "But hair will grow back." If she cut the boy's hair to their standard, it would take many, many months for it to grow back to where it is now.
Yes, this is extreme. But it makes the point.
No it doesn't. It's a non-sequitur.
And if any place required me doing anything to my sone I didn't agree with, I wouldn't send him there.
Of course, I think long hair on boys looks ridiculous. Makes them look like neglected orphans. Poor kid doesn't even care and is being used by his mother.