You are over simplifying things a bit. "Dangerous" covers a lot more then what can kill you. A good bite from a 6 foot python is VERY serious, might even need stitches. Within 5 years a properly cared for Burmese Python will be 10-13 feet long. Lets say a 10 year old kid gets one as a baby from the local petco. After two years that snake is going to be up for adoption or released when they find out no zoo or rescue wants them anymore.

Its a shame more people aren't properly educated and passing that education alone to others. You may think you are "defending" the rights of snake owners but you are doing the exact opposite.