It is a matter or personal choice whether people wish to be identifiable on the Internet. It is not a matter for criticism in the slightest and your approach to this does not take into choice or indeed common sense into account.
Indeed two clauses of your statement
- your slightly malformed intro "I need (to) understood why people do this." .
suggests a paranoia which is concerning. NB I have added in brackets the missing word so it makes sense as collection of words
Suggests a naive appreciation of the Internet. No one here is remotely related to me let alone in the family category so I treat everyone with appropriate reserve.