Yiddish: If pigs had horns, the world would be done for.

If the pig, unclean and despised, had destructive horns as well, it would wreak havoc on the world. Power should not be given to the wicked.  SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten.

דער חזיר זאָל האָבן הערנער, וואָלט די וועלט קיין קיום ניט געהאַט.

Der khazer zol hobn herner, volt di velt keyn kiem nit gehat.

If pigs had horns, the world would be done for.