The phoniness is shown by the argument Cuomo used to justify his support for abortion. He said that there was a societal consensus in favor of abortion, and that the common good dictated that he refrain from violating that consensus. Of course, Cuomo never lifted a finger to change that supposed consensus, never made any speech attempting to convince people that abortion was morally wrong, that they should change the law, even if he would not unilaterally attempt to change the law.
By contrast, Mario Cuomo regularly imposed his morality on the State of New York by vetoing legislation to allow the death penalty, even though there is much more of a consensus in favor of the death penalty (polls show over 80% of Americans favor it) than there is in support of abortion.
Mario Cuomo is a fraud, pure and simple.
That argument amounts to claiming that cowardice is a virtue.
The truth, of course, is that Cuomo believes that liberal orthodoxy trumps Catholic orthodoxy. He is an apostate, and should be treated as such until he repents.