Unable to delete app that has broken the Finder

I messed up today and installed an old version of Safari (10.x) onto my MacBook Pro running Mohave. The Finder crashes immediately and won't launch.

With no Finder, I tried using Terminal to delete Safari files (as root) but all of those files still return an "Operation not permitted" error.

Here's the error in the Problem report:

System Integrity Protection: enabled

Crashed Thread: Unknown

Exception Type: EXC_CRASH (SIGABRT)

Exception Codes: 0x0000000000000000, 0x0000000000000000

Exception Note: EXC_CORPSE_NOTIFY

Termination Reason: DYLD, [0x4] Symbol missing

Dyld Error Message:

symbol '_OBJC_CLASS_$__SFSharablePasswordReceiver' not found, expected in '/System/Library/Frameworks/SafariServices.framework/Versions/A/SafariServices', needed by '/System/Library/CoreServices/Finder.app/Contents/MacOS/Finder'

Any thoughts on what else I can try?