We're sorry about the trouble due to Lightroom crashing on launch on your Mac. You can try resetting the Preferences of Lightroom by pressing and holding the Shift + Option + Delete keys while launching Lightroom. When you get the window to confirm resetting the preferences, confirm that to launch the app.
Unfortunatelly the result is the same. I restarted the computer (for starters) then did as you suggested Shift+Option+Delete, got to the Lightroom dialog (Start Normally / Reset Preferences). Selected Reset Preferences. But got the same "Adobe Lightroom quit unexpectedly" dialog from Mac. 😞