The perfect is the enemy of the good

I can't speak for everywhere, but this line is frequently levied at the Greens party here in Australia, but it just doesn't hold up to scrutiny.

In all of the noteworthy cases where they've voted against the "good", they have negotiated and later ended up voting in favour of the "better". In no case did they hold up hoping for "perfect".

But they're still blamed for voting down climate policy way back in 2009, despite the fact that independent Treasury modelling said the 2009 bill's climate policy wouldn't have had any reduction in emissions until 2035. That wasn't even "good". So they voted it down and negotiated with the Prime Minister who replaced the megalomaniac that refused to negotiate the first time, and passed world-leading policy in 2010, seeing immediate reduction in emissions.