I don't think OP is concerned about the existence of one particular article, but rather the various systemic biases in what Wikipedia chooses to include or exclude.

True. Would be good to try that and see how it is handled

Asking for the help of others who may see this: Could you help in listing major mass killings by capitalist states?

Will mention ones that I can remember now:

USAmerican regime - Kent State Uni massacre, MOVE bombing, BLM protestors murdered for protesting against the racist regime

British colonial regime in India - Jalianwallah Bagh massacre, Wagon massacre, Massacre of tribes in hilly states
If famines are included, then the Bengal famine, Madras famine, Travancore famine etc.

Mass killings in areas like Ireland n all by the British capitalist regime too

South Korean regime - Jeju island, Bodo league massacres and similar mass killings

Mass killings by Nazi Germany