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With the . the author can claim it was unintentional. It's impossible (or at least very hard) to claim the Cyrillic c is unintentional.

To me, that makes the . more evil.

Well, on Russian keyboards, they are on the same key.

Good point - it might be plausible if the author actually were Russian, but they aren't.

Or are they?

Even someone provably not russian can just claim that they were learning the language (or a different one that also uses cyrillic).

Plausible deniability

also applies for c/с - the с (Cyrillic s) is on the same key as the Latin c on a Russian keyboard. bottom row starts with zxc/ячс respectively.