I understand where you're coming from, but it might just have been a simple accident and they're too poor or don't have the time to get it fixed. I went around with a shattered screen for about six months.
That's the exception for me. If the screen is cracked, but it bothers them I sympathize, but if it's cracked and they throw their phone around and get mad as if it was the phone's fault then I super, super judge them.
I have the same theory. Anytime I see someone having a phone call on speakerphone it's almost 100% because their screen is shattered and they just walk around screaming into their phone.
Makes sense that these are also the type of people walking around just raw dogging life with out a cell phone case.