Some people didn't think much of Alexander Haig. You have to evaluate him from the context of him being a military guy. He might seem to most to have been a fascist but in the context of his military background he was a relative moderate
When Watergate broke, Alexander Haig was working in the White House, very close to President Nixon. To many in the White House at the time, it didn't seem like that big a deal. He understood the situation right away. He got the Hell out of there quick and he took his friends with him.
Never waste time fortifying an indefensible position. You never leave a buddy behind. The rules of a soldier are simple, what's hard is remembering to follow them in a crisis.