The Agile Manifesto is a reasonable statement of a set of workable principles. Unfortunately, applying those principles requires understanding and skill, things that are apparently in short supply. The Agile business seeks to fill that void.
The Agile industry seeks to exploit the never ending search for the software development Silver Bullet, an elusive beast whose existence is mathematically impossible. You're right, good management requires leadership. something today's business culture tends to select against.