As they say in The American President, "You want free speech? Let's see you acknowledge a man whose words make your blood boil, who's standing center stage and advocating, at the top of his lungs, that which you would spend a lifetime opposing at the top of yours."
And, there is that little matter of loving your neighbor as yourself. No one wants to be lectured or shouted at or demeaned. Especially on Facebook. The fact that we all have different opinions and ideas is what makes this nation great. And I understand that these are BIG issues with outcomes that wound people's hearts and people feel I-N-C-R-E-D-I-B-L-Y passionate about them. There are many issues I feel incredibly strongly about too and there are also things that hurt my heart. But before I say anything publicly, I always try and remind myself that the person to whom (not AT whom) I'm speaking is a person. Like I am.
Just my opinion. Hopefully shared in a loving manner because you are a person too.