The problem is not FR24. As has been pointed out, sometimes the aircraft want to be seen, and sometimes they don't.
The problem is with the many "enthusiast" groups sharing and broadcasting additional information.
Ie " just seen 3 typhoons leave xyz, " or " i see the b52s are starting up". I am sure they would post up the pilots name and address if they thought it would garner a few extra FB likes.
If you don't understand that every little additional snippet "could" be useful to someone somewhere, then you need to have a rethink.