please answer question

The MTR announced that: \"When using an escalator, please held the handrail and stand rm. To avoid losing your balance and falling, don't walk on the escalator or focused entirely on your mobile phone.\" However, you should notice that it is very common that the passengers are still walking on the escalator. REQUIRED: Explain why this situation is still common in our society although it is prohibited by the MTR and such prohibition has been announced publicly for a long time