This is a tired mantra. It does not bear close scrutiny. It is a meme created by the wealthy and powerful to maintain their wealth and power. It is similar to the belief inculcated by royalty that they rule by divine right.
To what kind of scrutiny are you referring? I'd think that if governments were good at redistributing wealth, one of the many communist countries would have been a resounding success.
Can you point me to one?
I can point you to many information sources that show that economic freedom is closely correlated to average wealth and higher standards of living.