> I wouldn't word it like this if it wouldn't be a very noticable pattern of behaviour comming pretty much only from US customers.

But that's the thing... do you have access to a representative, uniform, random sample of US customers? Do you have a similar sample of customers from other regions to compare against? Are those samples based on your actual data rather than personal anecdotes? Have you eliminated hidden variables that could better explain this behavior than simply the place they are from?

If you answered "no" to any of the above, you're suffering from availability bias.

> After seeing it first-hand, I'm noticing this attitude even in fields like global politics, where burning goodwill to gain very minor advantages seems to be the policy these days.

And that one is called confirmation bias.