Even if you add scare quotes to the term as if you are the only one who can validate a prolife perspective. This needs to be said, because:
The falsehoods and calumny upon which he routinely rests his arguments is bad enough. That he suggests prolife is a heresy while demanding all people of good will align with the party that supports a variety of ungodly positions including, but not limited to, ESR (that's embryonic stem cell research), assisted suicide and the right to die, the modern drugs and sex culture despite the era of AIDS, as well as unchecked abortion rights from conception to birth, is appalling.
Worse, however, is the idea that someone stumbling around looking for some voice about Catholicism might find this and think it's true. After all, that's how I found Mark ages ago.
I had seen Scott Hahn talking about Confession on EWTN in a hotel room as I was traveling to Florida. I wasn't able to discover who Hahn was, so when I cam home I went looking to find him. That's when I stumbled across Mark who, at the time, had recently written a glowing review of the actor John Rhys Davies because Davies had just made an impassioned defense for Christian West demographics against the encroachment of Islamic influence.
That seemed sane to me, and it countered the impression many of us non-Catholics had that the Catholic Church had long ago rolled over and surrendered to the forces of the day. Seeing other pieces by Mark, such as a stirring call to arms after the 9/11 attacks, or his observation that the LGBTQ movement embodied a clear and obvious threat not only to the dignity of human relations, but also a threat to religious liberty, suggested he was one to read. Plus, as my wife said, he wrote the way I talked. That he was a Tolkien fan sealed the deal.
Granted, I didn't agree with everything I saw Mark write at that time. Nonetheless, the better seemed to outshine the bad, and his writings, among others, became a help for us getting our heads around Catholicism from an American Evangelical perspective.
Because of that and the fear that others might stumble upon him now and confuse his political zealotry with the actual Catholic Faith, I find it necessary to point out, again, that being prolife in ways Mark's support for the political Left does not agree with is not a heresy. Some might call it Christian virtue.
UPDATE: File under Wolf in Sheep's Clothing. Apparently his follow up to 'Murderous suicidal prolife heresy' is an article for Catholic Weekly in which he emphasizes the need for Christian unity and hot it is Satan who would have us turn on one another.
Geeesh. Again, so that those stumbling about looking for what Catholicism is all about can be warned, especially since there are still those who point to Mark as a valid outlet for learning about Catholicism and Catholic social teaching.