Most honest defense lawyers will really have the best interest of their client at heart, and just dismiss themselves if they feel they can't work with a certain prosecutor; they might even recommend their own replacement. After all, it's in their own best interest not to get what they feel is a sub-par result on their CV.

The fact that Swartz went through three lawyers, coupled with what the last one of them said, might as well indicate that all of them felt the prosecution was being unreasonable, and were hoping that a different person might have obtained better results.