Common Sense

It don't make much sense that common sense
don't make no sense no more.

— John Prine

My keyring holds two identical looking keys. 

One unlocks the front door; the other, the back.

Murphy's Law governs my keyring.

No matter which door I'm hoping to unlock, I always choose the wrong key.

That defies common sense.

But common sense is passé, anyway.

Today, we're "structurally stupid."

Or are we?

When I use my housekey, I do so in the firm belief that it will open the lock.

Even though it never does the first time, I believe it will.

I presuppose that turning the key will unlock the door.

Why do I believe so?

Experience. 

Know-how.

Trial and error.

The very same trial and error that underpins science.

I have an inductive means for making judgements about cause and effect in the real world.

Those means aren't perfect, but they're good enough to get me into the house.

They go by the name “common sense.”

No, we're not structurally stupid.

Some of us just prefer to be assholes.