I suppose at a very high level your thesis might be true, but at a practical level, I don't think it is. The banks have simply seen it's cheaper to eat the cost of fraud (and ensure the victim has the burden of proof wherever possible) than implement stricter security measures.
This goes from the transaction terminal to the bank's server room.
Europe has had chip cards for over 20 years. In the US, it was very recently implemented; only in the past year.
It wasn't that the US banks were occupying some "sweet spot" of retail transaction risk/reward; they simply didn't want to shell out the extra bucks to send people cards with chips in them. Neither merchant nor bank wanted to pay for chip-reading terminals. So, nobody budged until just the past year.
I don't know whether it was legislation, or perhaps the growing cost of credit card fraud (i.e. card skimmers, etc), but for whatever reason, it certainly wasn't a "sweet spot". We've had chip technology for 20+ years, they just didn't want to pay for it.