[Mr Ramsbotham]

Given that unemployment effect is as certain as the rising sun, why would politicians continue to think they can outperform a free market?

The answer is that they don't. They're interested in votes, not jobs for marginal workers. They know perfectly well the effects their policies will have, and they do not care.

[Adder]

Worse, they will call you a liar if you attempt to say higher minimum wages result in increased unemployment.