"Otherwise" when it means "or else" is often treated as a conjunction. I feel the way you do about it, but who cares what we think? You see this comma with "otherwise" all the time, and it does no real harm.
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"Otherwise" when it means "or else" is often treated as a conjunction. I feel the way you do about it, but who cares what we think? You see this comma with "otherwise" all the time, and it does no real harm.