That is true enough, and I don't get me wrong on this topic I do understand the sentiment that JK Rowling's opinion on this topic is unpopular, and that people want her beholden to it as an example. But we are all entitled to our opinions and even this very petition is an expression of that.
The catch is just that people only behold what they don't like, not what they also like/believe. Someone gave a good example before in this thread, that does against abortion should then adopt those unwanted babies.