If you look at what CP advocates say: it is all about ecology, emissions, congestion, freeing up the road for cyclists, etc. Some people mention MTA capital projects and ADA compliance, etc.
But no CP advocate has actually and honestly told the truth: MTA is underwater, its finances, collective bargaining agreement is unsustainable, fraud is rampant, without this extra tax they will simply go bankrupt.
This is the clearest case of mismanagement and dishonest communication with the taxpayers. CP funding should go directly to the city, and any capital MTA funding should come from loans that are repayable (either via additional citywide tax/tolls/fares/City general fund/etc).
You can't keep throwing good money after bad money into this financial black hole