After he lists all the various constitutional rights that the court pronounced before and after Roe and Casey, he says that Roe is different.
You could read Alito’s draft opinion as taking this approach. To them, same-sex marriage, if they still oppose it, does not present the existential life-or-death questions that abortion does and therefore doesn’t need to be overturned.
Those conservatives see Roe as a unique evil in the American constitutional firmament, both because they think it was responsible for the deaths of millions of human lives over the past half-century and because it is anathema to their preferred method of reading the Constitution.
Here is my basic read of the situation: There is a subset of conservatives who would be fine if the court overturns Roe and goes no further than that on other rights.
