Don't we all crave privacy?
everyone wants privacy and bitcoin is offering a very good level of privacy when you use it correctly. what it doesn't offer is full anonymity and it was never supposed to do that either.
Originally, Bitcoin network was thought to be anonymous. Everybody felt secure believing that no one could ever recognize them.
wrong. in fact "originally" bitcoin was known NOT to be anonymous, then as the market grew and more newbies came in SOME started thinking it is funny anonymous while the rest knew it is not.
It contains all the private records.
...public records... not private.
This unbolted the way for a lot of cyber hackers to extract information making it less secure.
it is publicly available, you don't need to be a "hacker" to extract anything! you just have to have time to waste analyzing the blockchain and it has nothing to do with "making it less secure"!
Also, anonymity was compromised due to the data leaks. Once identity is known of a Bitcoin user, anyone can go through his past and possible future transactions.
all you can do is speculate.
In the light of above explanation, should Bitcoin be upgraded by a confidential blockchain system which is scalable too?
no. because not only your "explanation" is filled with flaws but also the design of bitcoin is perfectly fine.