Their business model is to guarantee to buy up stock from breweries that is approaching the sell buy date, which they do for a lower price, which is in turn passed onto the customer. Lower prices drive volume sales and their profitability. Fair enough.
There is no need to pay their staff poorly and treat them badly. It's all about greed of parasites like Tim Martin.
I hope the likes of Martin, Branson, Ashley, etc get remembered for how they've treated people, when this is all over.