Answer:
Because it just leads to more lies
Step-by-step explanation:
Lets say you see five dollars on the table. You decide to steal it. Your parents ask you if you took it. You say no.
Lie count: 1
You then begin to say that when you came into the room, there wasn't any money on the table.
Lie count: 2
Your parents ask you if you saw anyone else come into the room.
You say yes and blame it on your sister, brother, friend, etc.
Lie count: 3
Now you just framed whoever you said came into the room. You probably will get in a fight later, and maybe even lose a friendship
Don't lie. It only causes more problems.