How do we know what we SHOULD consider a right, and what we should not?"
Yes I know. I wasn't going to give an answer though. LOL! Here's a short one.
Rights are claimed by the individual to protect his nature, essence and sovereignty of will. Just as he claims the right ot life, he also claims the right to wear a blue shoe and a yellow one at the same time. The only limits on what is claimed as his right, is that it not infringe on the rights of others. This is the nature of Freedom. Govm'ts role is to protect life and rights, nothing more.
I wonder why others won't offer an answer?