If I told you to think of a number from 1 to 100
the result will be different every time I ask you
Lots of factors affect this number. There are the external factors like the weather (cold, hot, windy, humid) or the internal factors like your mood (sad, happy) , status (married, single), health (fatigue, healthy) etc..
All those factors get fed into the function of your random generator and generate a number that is dependent on these factor.
Imagine if we can hypothetically gathered 100 serial killers and ask them to choose a number between 1 to 100, while we try to fix the other external factors as much as we can. Then chart the results. We do the same with 100 child abusers, 100 nurses. Compare the results
We will get interesting results, we will get pattern.
So whatever random number you select. This number hold information, very valuable information. its not so random after all.
Think of that.