Frankly I've not met someone who's worked in retail in the last 15 years who's said they had a different policy. Even a cart full of shit is cheaper to pay for than the potential lawsuits from an employee getting hurt from trying to intervene.
Beyond that though, please don't put your life at risk for your employers merchandise. It is not yours. Your store carries insurance for a reason. Your life is not worth any of that shit.
For any reason that isn't specifically a protected class*
Although in practice that just means if they want to fire you for discriminatory reasons, they just don't give a reason.