Earlier quoted context omitted.
If it’s real you don’t need to be anonymous.
Fear of retribution/not wanting to get involved is a real thing. Also are you proposing that 911 operators confirm people's real identities before accepting their call and dispatching someone?
Someone else pointed out that the whole phone system is a dog's breakfast, which also needs to be fixed for various easy-scam-exploitation reasons as well. The only reason not to do it is that the corps that run the networks don't want to have to pay to make their shit fit for society's purpose rather than their own.