Because you can't argue with all the fools in the world. It's easier to let them have their way, then trick them when they're not paying attention.

This quote suggests that it can be hard to fight the opinion of a large majority of people who are not intelligent or informed. It may be simpler to pretend to agree with them but then do something different when they are not looking. This way, we can achieve the desired outcome without having to waste energy arguing.