A typical case might be:
1. Developer releases free app
2. Users find it useful
3. Developer seeks to monetize, adds some mobile ad network libraries
4. Ad network libraries want the user's location
5. User's who liked the app now find themselves OK'ing a frivolous-seeming permission during an update, or they have to uninstall the app, potentially losing access to some of their own data.
And so we find our developer on the slippery slope. Putting the power to cause those apps to fail when they do dubious things in the user's hands means that developers would be more discriminating about their monetization partners, among other benefits.