If your users are productive, chances are so is the company that pays both your salaries. If your users have to fight their infrastructure people to get their jobs done, you company will fail to effectively compete against those companies that don't.
It astounds me that so few security people understand what their purpose is: Your purpose is to assist the company you work for to keep on existing, and even make a profit. If you disempower those that are most effective in helping the company do what it does you're effectively destroying your own livelihood, and everyone else that is dependent on it.