If there are ten employees you need to cut, shouldn't they be cut based on either their recent performance, or a completely random method?
No, because layoffs are position-based. If it's a performance related cull then that's not the same as redundancies. If you want to get rid of people like that then you need ironclad documentation and/or to provide generous packages.
Maybe it's putting lipstick on a pig, maybe it's fairness.
Layoffs (mass dismissal) are very hard, because usually it means the whole region has economic problems, and those that get laid off are especially vulnerable - because they almost by definition work in a sort of dying industry/trade.