Apart from what myrkul is saying, here you are supposing governments are a force towards equality, you are supposing that politicians actually take from the rich to give to the poor (in simple terms). What we see in reality is the opposite. Governtments are a force that creates more inequality by favoring the corporate budies of the politicians at the expense of the middle and poor classes, that are left with no oportunities, expensive prices and some defective government minimum services so they dont die and can keep working.
Some government actions are a force against equality, other government actions are a force towards equality. That's because we are heading towards a plutocracy/oligarchy instead of enhacing our democracy.
So I would say that government actions CAN be a force towards equality.
Howcome all democracies do the same (with different excuses)? I know, its not a real democracy... Arent you drinking the kool aid?