“You should have the right to state the rules for your own property. “
Your statement is an opinion or assertion, and that’s fine in so far as you’re entitled to have and assert your opinion.
But what is the basis for that opinion? What would you say to convince someone who disagrees with you that you are correct and they are not?
It is not opinion, it is the law. The State of Texas has written into the code of law that signage properly placed prohibits weapons on the premises or in the establishment where found is that sign. That is the law. If you violate the law, you will be arrested. Pretty simple concept.
Although I own a gun, have a CHL and believe I am responsible enough to carry (at least concealed) anywhere, I still must follow the law. When each individual decides to become the law, the term for that is "anarchy" and that is a very undesireable living environment.