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I think they likely fall into the same trap Martin Luther et al. fell into. They realise they can't(read: won't) give up their sins, so they kid themselves into thinking their sins don't really matter.

You are correct.  I have called many of them out.  I've run across former Catholics who were promoting Protestantism and hostile towards Catholicism in various contexts (in person or on message boards).  I usually get blunt --

"So, let me guess.  You rejected Catholicism in favor of Protestantism because either 1) you wanted to get divorced and remarried or 2) you had some problem with Confession."  They never deny this.

It's ALWAYS one of those two things and not because they objectively found errors in Catholic theology.  They merely convince themselves of these things AFTER THE FACT in order to rationalize and justify their abandonment of the Church.  And they get really hostile towards the Church precisely because deep down their consciences know this, so they rage against the goads of their conscience, trying to silence it with their hostility towards Catholicism.

This is why Protestantism appeals to people over Catholicism, and it's the only reason ... and it's why various forms of Protestantism were created in the first place (from Luther to Henry VIII).  Protestantism holds that sin is irrelevant and that you just waive your hand around saying "Jesus" and you're saved.  You pay lip service to Jesus being your personal savior, but then live your life however you want and commit whatever sins you want.