I can understand your feelings and I don't completely disagree with them either. However I think the issue is that many if not most people have a line they draw where everything beyond it is personal and private and they do not willingly share this information with people unless it's family or very close friends. There have been suicides over people being "outed" for their sexual preference or other intensely personal things. This is bad enough in the hands of normal bullies, but in the hands of government bullies people can be jailed, legitimate governments destroyed and illegitimate governments upheld. Commercial bullies can use secret information to coerce officials into placing outlandish restrictions on our rights as well. I could of course go on and on.
I am under no illusions that we in fact have any sort of real privacy anymore. I know that ended decades ago. However I think that we have the duty to try to make it difficult for those that want to catalog us in every way, reducing our humanity to data points. I for one will continue to try to shovel back the tide, no matter how pointless it may be.