You're right on all the issues you mentioned.And let's not forget:
No, President Obama should not be pardoned.
People died in Mexico.
People died in America.
People died in Benghazi.
Not as result of normal warfare but because of calculated strategies meant to circumvent the Constitution or protect a political campaign. In fact, deaths might even have been considered crucial to the success of these activities.
Watergate was about a political campaign but nobody died or was even injured. Not the same at all.
You're right on all the issues you mentioned.