Spin and Deflection.

 From a real White House press conference.

REPORTER: "Why does the President support abortion when his own Catholic faith teaches it is morally wrong?" PSAKI: "I know you have never faced those choices, nor have you ever been pregnant, but for women out there who have faced those choices, this is a difficult thing."

Eh?

So, the logical questions, stated in full, is why does Joe Biden support abortion; 1) which his professed faith, the Catholic faith, regards as a mortal sin and which the support of which would also be regarded as a mortal sin.

Such support would require some fairly complicated and sophisticated reasoning.  Instead of that we got; the reporter isn't a woman and has never faced the choice to directly commit the mortal sin and that for (some) women choosing to commit what the Church regards as a mortal sin is personally a difficult issue.

Stringing that together, the logic would be that when a difficult choice is involved Joe Biden prefers to commit mortal sin, through his support of abortion, rather than take a publically difficult position.

Now, what could explain that.  Several things

1.  Temporal cowardice.

2.  Impaired reasoning combined with acclimation to moral mushiness through long practice of the same.

Neither of which are actually good basis for "why", even if they form the actual basis.

Or, another explanation being that Psaki doesn't know the reason and can't think of one on the spot, so she's just using the "I'm rubber, you're glue" argument so as to not have to say; "I don't know".