That's actually a bad lesson to learn as a hero though. While its a good thing to not be too reckless if you just don't fight until you have a full plan and are strong enough then not only does it stop you from getting better at fighting in general but a hero is also about public opinion. When you lose that you partially lose the point of your existence.
Unless of course the plan was to fight through and save the world by yourselves, then you could do whatever.