The lawlessness that ensued during the Obama tenure has easily placed the US into the "banana republic" category. 
His dealings with Iran, in and by itself is treason. 
Fast & Furious? Treason. 
His release of detainees from GITMO (resulting in the deaths of countless Americans)? Treason. 
Use of NSA, FBI, AND CIA to spy on citizens and political adversaries alike! Hundreds (or thousands) of felonies. 
Using the IRS against political adversaries? Again, multiple felonies. 
Contributing to, or covering up the cause of death of a United States Ambassador, along with three US Service members/operatives? Death penalty.

I find no words to describe how strongly I believe you're wrong. In our history, no single Commander in Chief has committed so many crimes against our nation, it's citizens, the Constitution, or our armed forces. Your contention that no POTUS can ever be charged is EXACTLY the mindset Barack Obama counted on everytime he directed an illegal act.