I'd go back to 2010 and suggest the Tories were bereft of any policies to attack Labour with. There was much they agreed with, when both parties held similar ground in the middle. It didn't do them any harm. They watched Labour implode. I suspect Labour are doing the same and watching the Tories implode. Do nothing wrong or idiotic.
It's utter shit and does nothing for the electorate, but waiting for the other to fall is quite a common tactic nowadays.