The idea behind a constitution is to provide a framework of rights that cannot be "updated " on a whim. It's supposed to be basic rights that transcend time.
I do agree that review and updating based on the current times and wants of the population governed by it should happen. I do not agree that it should be easy or frequent. To see it as something that should be able to be changed easily would make having it moot. What protection would it offer of it can be changed to revoke that protection at any time?
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Convicted of a crime is not the same as accused.
I agree that those convicted of domestic violence should not own weapons. I do not agree that those suspected of domestic violence have that right revoked.
When you commit a crime you do not lose rights. What happens is you forefit those rights. Same effect but the execution is important.