“I Care a Lot” takes the anti-capitalist screed genre to a new extreme: ruthlessly robbing grannies.

Rosamund Pike plays Marla, a woman who works as a court-appointed guardian to elderly people who either have no family, or whose relatives are not fit to take care of them. It’s an easy, if soulless, gig. Once her wards die, she gets to keep their cash.

Marla makes her already sleazy profession even more unethical by bribing doctors to testify under oath that some older patients are worse off than they are, forcing them into her grubby clutches. 

“Playing fair is a joke invented by rich people to keep the rest of us poor,” says Pike in that calm-but-threatening voice of hers during a narration. “You’re not good people. There’s...