Because you are counting how many *entities* are in your set/group. Entities are always considered plural when counting.
Value “one” (1) is a special exception, the only exception indeed. Better question could be “why we do not use s for everything while counting?” and the answer will be something like “because one (1) is the measurement unit of set/groups and a single unit is indeed singular, multiple units will be plural” (also, the word itself ‘unit’ follow that rule as well)
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