Why screening is necessary

This is the honest truth. I was feeling that it was too intrusive to ask people for their full name. I had actually gone in and changed it to first name only. Then I was going through my texts and I came across a gentleman who I had trouble verifying the other day. So I checked him out and found out that he was a rapist and a thief. No lie. This just happened. 3-22-18, 9:55 pm. I got a cold awakening as to why this process is necessary.