His point isn't "do evil so that good may come", but rather "it is better (for us) for those who do evil to do it openly so we can unite against it, rather than

His point isn't "do evil so that good may come", but rather "it is better (for us) for those who do evil to do it openly so we can unite against it, rather than for it to be done with subtlety so that we remain unable to combat it."