I wrote up on why the pro-life and disability rights movements should work together as I think that there are common principles. In 2019, it was published in America.
But why not work together on assisted suicide and on selective abortions because a baby is disabled which are issues where even pro-abortion disability rights people usually agree with pro-life people.
...for a purely worldly reason, Father. The nature of politics means individual issues are lumped under a single political cause. People who are strong supporters of the cause despise those whose allegiance varies from issue to issue. With good reason; they're traitors. The group you help today will be the same group stabbing you in the back tomorrow. For example, pro-life advocates don't want to help those who are in other instances , pro-abortion. Those of us who recognize abortion is always wrong want no common ground with those who are quite happy murdering infants on a case by case basis when it suits them.
"Dude, this is how you need to respond in your other conversations on here." I usually do @Mathathias Maccabeus Father is being courteous and even if he were not, he is a unique case. As a Catholic priest, he is entitled to courtesy by simply virtue of his ordination. People tend to admonish me (like you're doing here) while ignoring all the nastiness they eagerly dished out (like you did here) I won't foul up Father's post with a direct quote. With my fellow laity, I follow a simple standard. I give what I get.