What if we did a zero-flap departure and crashed the plane on take off?
You are operating as per the manual when departing with 0 deg flap.
172R Skyhawk Information Manual - Section 4 -Normal Procedures - Wing Flap Settings Page 4-25 says -
Normal take offs are accomplished with wing flaps 0 to 10 deg. Using 10 deg wing flaps reduces the ground roll and total distance.........etc