I can see not wanting to get involved during WWI, but Hitler wanted complete control of Europe (and eventually the rest of the world, if I understand correctly). Why not Switzerland?
There's this in the FAQ section for World War II minor powers: "Why did Hitler not invade Switzerland?" at https://www.reddit.com/r/AskHistorians/comments/4rciqp/why_did_hitler_not_invade_switzerland/d4zyeul/ , answers by /u/Georgy_K_Zhukov .
This is just a starting point, not to discourage discussion. Further questions, data, and debate are welcome.