Thoughts
It really is a privilege to be able to be an idealist, to wait until you hear something that sounds good to believe it.
My point is that a lot of people don't have the privilege to choose an internally consistent correct and kind ideology. They need to do something. As a low stakes-example, saying, "you should never feed your kids fast food." Regardless of whether that's a good rule, it's idealist because that's not helpful in finding food for your kids to eat tonight.
Edit: I think where I was going with this is that it's possible to align yourself with system or rules that are obviously good and correct (like a complex dietary plan for your kids) that are equally useless at solving problems (like where you're going to eat tonight).