Joseph is an emotionally unhealthy man, who frequents this site. He abuses other posters in order to discredit them, so that people will listen to him.
He thinks he is doing a mitzva, because he believes in a very radical misinterpretation of Judaism, and he believes he is doing ratzon Hashem by spreading it. (He seems to forget that Hashem probably also doesn’t want him to hurt people.)
He thinks that anyone who persuasively disagrees with him is destroying his ability to transmit the “real” Judaism, and therefore must be silenced.
He has multiple screennames, for two reasons:
First, because the moderators have banned him, so he continually makes new names to evade them.
Second, because he uses them to create different personalities so that he can prey on our emotions from different perspectives.
I do not think he is a bad person. But he hurts people on purpose. We should daven for him.