Without having any real evidence to back up the theory, I have always thought that writers could be divided up into two categories: those who court controversy and those who avoid it. (I later realised there was a third category – writers who are controversial without realising it – and you can read a bit about that here.)
I also figured out a long time ago that getting involved in any type of controversy tends to leave me upset in greater proportion to any change I may be able to effect in advocating for one side or another. So I generally try to stay quiet unless I feel very strongly. And even then, I moderate myself and think long and hard about how to phrase what I want to say in order to avoid reactions from trolls and people who never change their mind about anything even in the face of overwhelmingly logical arguments. After all, the vitriol of stupid people can be vicious and my greatest ambition is an easy life.
Besides, how much controversy is there in writing really?