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Is it?

If you're a bad person working for the Red Cross, and you saved the lives of strangers, that makes you less bad.

If you're a good person working for a company that manufactures antipersonnel mines, that makes you less good.

Working for a company that creates life-saving vaccines, or builds homes for underprivileged people, or increases yields of crops to match the demands of a growing population doesn't make you a good person? Well, how high is your threshold then?

I don't think that the work you do should be the only thing that defines what type of person you are. Someone could work at those types of companies and be a serial killer in their free time.

I agree with you, if you're working for a bad company and you're actively sabotaging them then the OP's observation does not hold.