What would you do if some strangers borrow your phone and accidentally or intentionally broke your phone or just broke the screen or lcd? Would you ask them to pay for it or not?
If they were financially struggling I'd make a deal with them to repay in small installments that are feasible and dont put too much pressure on them . If it was intentional I'd try to find out why . Ultimately you're responsible too so cant be that mad
Intentional breakage is an issue, and could result in civil action in court. Accidental breakage would be my own risk for allowing them to use the device.