And even if we ignore issues with too large working sets and only focus on memory allocations, then if some badly written program eats all memory, then running

And even if we ignore issues with too large working sets and only focus on memory allocations, then if some badly written program eats all memory, then running some OOM killer (who hopefully kills the offender) is better than keeping it running and just failing all consequent allocations, as such system is unusable anyways.