Car 30, why was this a ‘mistake’. What was the plan, why was this choice of action chosen?
Why did the actual braking distance deviate from the plan. Did it matter either way, brake harder or continue down the runway (taxiway ?), assuming that both options were operationally safe.
The issue of cabin crew is separate safety problem which you should not have to worry about during landing.
Use the brakes for safety not comfort, brake as hard as you like, any time, for the situation as you see it.