So it's about propaganda?
Indeed, nought else. PO doesn't have anything but propaganda. They pull their arguments from their seat in an ivory tower. They're counting on German support, German press in Poland, Soros funds or whatnot.
The bottom line is that they have nothing to offer for the populace at large. Never had but right now they don't even bother to pretend that they have.
They count on various interest groups, post-commies, benefactor of the system that are numerous and few lost souls. Would that be enough?
The play go about 15 to 25% of people who bother to go to the ballot box - frequently or less frequently. Those people aren't a one party electorate so often they're able to tip the balance in an election.
Those people (many of them) voted PO to power or didn't voted at all. Then voted PiS to power. They won't switch back to PO anytime soon, Petru's party is seen as PO sidekick and he personally has an opinion as a dumb clown.
People who are fooling themselves that PO have a fighting chance to win the next election are detached from the reality and a mind-set of the average Polish voter.