Depends on how you define moral laws. Morality is usually defined as shared values within a community, in this case the State of Texas. A majority of people in the state of Texas through their elected representatives have decided that this should be a crime. Individual morality doesn't exist. As an individual, I could decide that anything is moral including murder if it profitted me or any other act that I could justify as an individual. Just because we as individuals don't agree with something, doesn't make it immoral.