Drugs are illegal
I saw a character in a TV show chastise another character for having hash oil in her purse by saying, "Drugs are still illegal."
Of course, not all drugs are illegal! Alcohol is not, tobacco is not, and aspirin is not.
If the character speaking had wanted to be precise, she would have said, "Illegal drugs are illegal." But then we have a mere pleonasm! And that formulation might lead us to question why some drugs are legal, and others are not.
A similar situation occurs when someone asserts that a Christian bakery should not be able to refuse to bake a cake for a same-sex wedding because "discrimination is wrong." Of course, such people are perfectly happy to discriminate among many other possible sorts of weddings, e.g., brother-sister weddings, and child weddings, and polygamous weddings. What they are really claiming is that wrongful discrimination is wrong: which is, of course, true by definition.
But by phrasing this as they do, they are begging the question, because, of course, the Christian bakers do not think that discriminating between opposite-sex and same-sex weddings is not discrimination, they think it is not wrongful discrimination: they think it is a perfectly legitimate form of discrimination, just as their opponents think discriminating between non-brother-sister and brother-sister weddings is not wrong. To simply declare that "discrimination is wrong" as a way to condemn the Christian bakers is an attempt to shut off discussion by illegitimately conflating "wrongful discrimination is wrong" with "any discrimination is wrong," the latter of which they themselves do not believe.