Wikipedia defines common sense as “knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument”
Try to avoid using this topic to express niche or unpopular opinions (they’re a dime a dozen) but instead consider provable intuitive facts.
‘Building more lanes will reduce traffic’ is a classic.
They enlarged rt 3 near rt 95 in MA many years ago. It was getting backed up due to all of the people moving further out from Boston. I said “It will be full again in a few years.” Yup. It was moving well for a few years so everyone piled into that area because the commute was better and within a few years it was a traffic jam again.
Of course! Our society couldn’t have multiple moving parts, could it?
And honestly, that’s a great example of the shortcomings of “common sense”. What people mean when they say there’s not enough common sense is that the people who aren’t “common” (like them) must all be stupid. In reality, pretty much everyone in every position is doing exactly what anyone would, if only they knew the situation.