no you cannot.
the gender of adjective needs to match gender of pronoun. But of course, women, children, animals and inanimate objects, can be evil too .
Oni są źli, (masculine persons, or a group that contains at least one person and one masculine noun)
one są złe (no men allowed)
thanks for responding but I'm not convinced yet.
Oni must contain masculine nouns, but they don't have to be people, right? Lets say oni refers to a pack of dogs / psy
If they are not people, how can you use the masc. personal. plural form of the adjective.? you have to use the other plural form.
"Psy są złe" is correct, tak? so therefore "oni są złe" has to be possible too
If you are saying "chłopcy są źli.", then you can replace with pronoun to get "oni są źli."