I am not sure if stating his "opinions" publicly would be illegal in most countries.
In Germany, it probably isn't, but he certainly wouldn't make friends that way. After all, he doesn't want to kill people, he wants to remove constitutional rights from people. This is impossible in any civilised country without changing the constitution, which is anything but likely to get though.
However, nobody of us has the (moral) right to prevent him from stating his views. If he "behaves", he may very well do that even in our forum - in the "General discussion" section (the top one, not the "Nexuiz - General discussion" one). However, as we easily saw, he isn't discussion in any sane way - it doesn't take long until he utters insults, which are NOT covered by free speech any more. Plus, I think propaganda (as in his MOTD) is not covered by freedom of speech.
BTW, strictly speaking, even a "serious" discussion about these topics may not be covered by freedom of speech - Art. 18 of the German constitution ("Grundgesetz") says that you can lose freedom of speech if you abuse it to fight against the free democratic basic order (which e.g. includes granting the human rights to people) - and I think mikeeusa does exactly that, because, what else is propaganda against Art. 3 GG (equality in law, especially with respect to gender, lineage, race, language, homeland, belief, religious and political views)?
Still, I'd tolerate a serious discussion about such topics - but mikeeusa apparently isn't able to. He seems to have no arguments other than "death to women's rights", which he can't back up.
I think the appropriate way to fight his propaganda would be changing the master servers to drop servers based on IP ranges and keywords in the host name. A proof of concept can be found in
http://mensa.ath.cx/~polzer/temp/dpmaster-filter.patch
BTW: before anyone brings up that topic... Angela Merkel doesn't count as woman

(or as Mittermeier said, "Ich will ja nicht auf der Merkel rumreiten, aber naja, wer will das schon?")
1. Open Notepad
2. Paste: ÿþMSMSMS
3. Save
4. Open the file in Notepad again
You can vary the number of "MS", so you can clearly see it's MS which is causing it.