The rule the Rabbis used (or to be accurate, inherited from the Pharisees) was that you always err on the side of caution where the Law's concerned. So if the commandment forbids you to abuse the name of God, don't use it at all, so you don't run the risk of abusing it by mistake. If you're not supposed to boil a kid in its mother's milk, don't mix meat and dairy produce at all, so you avoid any possible risk of doing so.