The issue is that most (if you define most as >50%) get panels that are defect free, and some get screwed while paying the same price. I think that is fundamentally unfair.
isn't it like most consumers accpet them, so what's the issue?
And I'd be fine with that. If a customer pays for a panel with 1024x768 working pixels, they shouldn't get a panel with (1024x768)-1 working pixels.
if everyone returned them for the smallest problem then they would only cost that much more..
Right on the money (literally). If I sell a ThinkPad (or any other goods) here, or on the Arstechnica agora, or on eBay, I am legally obligated under the Uniform Commercial Code 1-203 and 2-103 to deal in good faith, which means I have a duty to disclose material defects in the items that I sell. Stuck pixels are glaring cosmetic defects that people notice. I would have to disclose any panel defects in a notebook I sell.
On the open market, a notebook with a defective panel will probably sell for only 80% of what a comparable unit with a perfect panel will sell for (just ask Bill Morrow - the open box machines he sells with stuck pixels command "substantial" discounts).
You should return it - even one dead pixel significantly lowers the machine's value in case you want to resell it.