Why do athletes feel the needs to use steroids?

Why do athletes feel the needs to use steroids?
 Are There Natural Alternatives to Steroids?
Now let's look at a newbie who isn't on drugs, but is following a strength building program and proper muscle building diet. This person can be expected to gain anywhere from 20 to 30 pounds of pure muscle during his first lifting year – assuming he does everything correctly.
Another study focused on an elite bodybuilder and shows the power of steroids.
The researchers decided to watch him for 12 months. During that time, he used steroids for the entire time except for 4 weeks. And within that year, he ended up gaining 15 pounds of pure muscle.
Obviously, considering his strength and experience, this is pretty dramatic.
Finally, McLean Hospital took a look into this as well. But first, we need to talk about lean body mass. This is basically everything that's found in your body that doesn't actually have fat, so things like water, bone, and muscle. Fat-free mass index (FFMI) is the unit of measure based on how muscular you are. This number is divided by the fat-free body mass divided by your height.
Back to the study. They looked into 157 male athletes, some of which included major bodybuilders, half of whom used steroids and half who had never. Of the men who used steroids, about two-thirds of these men had used them within the last year.
They found that the men who used steroids had an FFMI of around 25.
The non-user?
He was about 22. The best physique without drugs was at 25, with the best physique with drugs at 32.
So what does this mean?
Steroids, while illegal, do work;