They know that this crap doesn't work. It's been proven over and over again. So, what's their true motives? Power? Greed? both probably
I'd say Nieviety
These politicians have lived their lives in a protected and supervised bubble. None of them have ever worked a real job, never built anything, never sacrificed for others, and my bet is that the majority of them do not believe in God.
They are truly lost, but well financed to get their message into the hands of the voting illiterate.