What specifically is the objection to doing it?
Very simple, there is a tendency about that implies if your against something like this your are obviously against "safety" and should be treated as a pariah.
As has been said this "requirement" only came about because someone with influence in political circles bent a few ears. No one is required to know when I get in my car, sail a boat, drive a power boat, launch myself of a cliff in a hang glider, go walking or multitudes of other activities.
I do not accept that some one who just sits in a room with a radio has the right to know my personal details of where I am going, lets hear from those who are at the other end of the radio tell us what they do with this information of where we are flying too, and once the words "changing to xxxxx" are spoken, then are they at the least bit concerned about my welfare I doubt it.