No no. Dr. Maxis was the head of 935, which was supposed to help mankind. 935 was stationed in Germany. They chose to assist the Nazi Party for funding, nothing more. We have logs of Maxis's thoughts on this. He was horrified of what the Nazis would do. Richtofen used to be sane, but when he found the Pyramid, he went nuts. Maxis was good. Richtofen is evil.
In the start, both men were evil because they were making mass destructive weapons. Richtofen was less evil and more concentrated with the teleportation. When he teleported to the Moon base and touched the MPD, he started to hear voices in his head and that's what made him angry. Maxis' affection with Sofia made him a softer man, denying the mass production of the Wunderwaffe DG2. Richtofen, now evil and madd, wanted to control the zombies. Maxis stops him in the end by lessening Richtofen's power.
They worked for the Nazi, so in some point of view they are both evil.
But Nazis weren't outright evil. Sure their ideals were evil, but well... Nazis were people too. They were poor farmers and villagers that took Hitler's lead. But enough about that.
Group 935's OFFICIAL motto was "to improve the human condition". And they had NO affiliation with the Nazis. Maxis and Richtofen worked together to accomplish their goal. Richtofen started creating the Teleporter, but Maxis said that wouldn't help them at all. However, later, since 935 was in Germany, and Germany had started World War II, funds were tight. Maxis signed a contract with the Nazi Party to PREVENT the destruction of 935, so they could further help the human condition. He never thought that World War II would be one of the worst wars in history. (By the way, it wasn't called World War II at the time.)
richtofen is the grandmaster of zombies. He was helping Dr.Maxis with the creation of zombies originally but ultimately betrayed him for his own uses, creating samantha in the process. then when all is said and done, he betrays his former allies to swtich bodies with samantha so he could take control of the zombies for himself, which was his ultimate plan from the begining. of course Maxis had an ace up his sleeve, "blowing up earth", but as of now we don't know what will come to pass in Treyarch's next game. All that can be said is Richtofen is pure evil and he will most likely be the main antagonist of the next game for zombies.