Earlier quoted context omitted.
This is a pretty lazy narrative. Prices are rising even in non-branded goods and markets. Smaller retailers are not-undercutting the bigger retailers. Couscous and margarine and eggs being more expensive across the board at the supplier level. This does not speak to any sort of cartel behavior.
Not to veer off into the psychology of it, but there's just such an overwhelming desire by most people to place blame for any misfortune on some intentional human behavior.
Also with a "big evil" you can tell yourself that removing that evil would solve everything.