Why does mitch mcConnell believe the inefficiency of elections is actually a postive thing

Because allow politicians to do whatever they want.

Explanation:

Mitch McConnell is a well-known political, hate it for a lot of people in his field. Obviously, this type of inefficiency don't benefit common people, but politicians, that's why McConnell didn't support the decision of reinforcing the voting system security.

So, a inefficient system, at the end, benefit them, such as politically or economically.

McConnell is a Republican, and he received the most votes in 2014. U. S. Senate general elections. He believes that this is a positive thing because it can contribute to the freedom and prosperity in America. For him, it was definitely positive because it gave him a lot of power and influence.