Okay people you are supposed to be at the airport TWO hours before your flight leaves?

so this guest at my hotel was supposed to have a taxi from here to the airport and the cab was running late and she is throwing a fit because her flight leaves in LESS THAN AN HOUR!! WTF? Don't people know that you should plan for these contingencies when you travel? Why would you be pissed at the hotel front desk guy because the CAB that YOU called is running late? TELL ME PLEASE!?!?!?!?