The point of 911 is to have emergency responders come to your location. If you don't want emergency responders to come to your location, you shouldn't be calling 911, full stop.
full stop
This trivially becomes a back door for malware that can initiate phone calls, by circumventing ordinary OS security and control.
Maybe there's a reason to intercept location data (e.g. cheating spouse), via a completed call that transmits a silent audio channel. So the software lands on the device, initiates a 911 call just to obtain the location of the device and send it to a botnet, and immediately hangs up.
Mission Accomplished: spouse is confirmed to be cheating. At the expense of an extra ring to 911.
This example is facetious. There are other reasons to snoop on a single individual's location data.
Now the calls are being triggered by remote software control, with your phone being hijacked as a proxy device, and who is left to blame?
Maybe your brain finds it convenient to shut off there, but not for many of us. We have experience reporting crime but don't want to be identified because the rest of the criminal's cronies could turn on us.
Without knowing how our information travels once it leaves our hands, retaliation from crooked government organizations, gangs, small time mobs, abusive family members is all too possible. And we all know how information wants to travel.
Providing the location has literally nothing to do with anonymity in this scenario. If your cell phone is not traceable to you, then it doesn't matter if your 911 call is accompanied by location info automatically. You're going to provide that same location info to the dispatcher anyway. And the criminals involved will also know the location because they are there committing the crime.
I'm not saying that I don't think there is a use for this feature, but your claims are bordering on the absurd.