How is it people don't understand basic principles of profit?

I had a coworker today come over with an invoice, asking if we had been billed for tarrifs on our parts yet.

I told her I didn't know because I don't deal with purchase orders.

She said, "I got one on this invoice, and I don't think that is how tarrifs work. Why do they have a tarrif on something made in the US?"

I said, "More than likely, they use materials they have to get from overseas distributors."

She seemed shocked. "Well that isn't right then! They need to deal with the tarrifs! They are the ones who decided to use materials from overseas!"

I looked at her and said, "That's not how tarrifs work. That is what our government has tried to tell us, that businesses will absorb the tarrifs, but that isn't how the reality works. Every business will always pass the tarrif costs onto the end consumer. This is why everything is costing so much more now. We are paying the tarrifs."

"That's not right! We shouldn't have to pay that!"

"That is how businesses have always operated and always will."

I wish people understood the basics of economics. They are too easily fooled.