Paranoia makes people conceal our identity, but if nobody knows who you are, then is there any point saying what you think?
The rest of us shrug and go “meh – just another cyber troll pushing their agenda. Plenty more where they came from and plenty of the opposite camp too.
Personal details can be used for identity fraud:
e.g. security question: “What’s your date of birth?”
Well seriously… if you have it so as you can check it… then chances are others have it too and maybe so that they can abuse it.
Insurance companies might use DNA or your history to deny those who most need cover and our history can be abused to deny us employment, credit, membership.