well i only know what happened last GE. So that's all the justification they need for charging which was answering your original question. If PAP is illogical to you, you should not vote nor encourage people to vote for them. If you agree with them, then vote for them. That's all.
Collectively next GE will also determine justification. Whoever wins will be justified in doing what they want with the mandate given to them. That's democracy. You get to live with what you (Singaporeans collectively) voted for. Stupid, smart, good, bad, ugly whatever you (collectively) voted for is what you get. As to who wins next GE, I have no crystal ball.