Why aren't rights absolute

They are there as boundaries, if you break them you have to face the consequences and you could actually have so rights taken away on how bad the one you break is. Like if you shoot up a school you can have the right to bear arms taken away from you.

The Right to Free Speech does not allow you to yell "Fire" in a movie theater. When they start conflicting with the rights of others, they aren't absolute. As another example, the right to religion does not allow you to marry 13 year old girls even if it is your religion. There are limits on all of the rights enshrined in the Bill of Rights, but when they are limited, they are subject to strict scrutiny by the courts.