Why is it that the most inexperienced and not thought out in life vote to the left? Are they at a carnival and they are the mark?

If you don't realize that Trump is a fraud, YOU are the mark.

No one can see beyond their own blinkers. That is true for everyone, including me and you. Maybe the people who vote for left-leaning parties see life differently, identify what they see as the real problems facing society and see different solutions to those problems, maybe more sustainable, more socially responsible solutions. If your blinkers do not allow you to see it from their perspective, does that mean they are wrong?
The dumbest person on earth would be the last one to realise it. They'd plod through life thinking they were wonderful and everyone else was wrong. What is worrying is that could be me or you.