Why is the police fingerprint and database only those of criminals...?:
Civil rights- we are innocent until proved guilty, and having everyone on a database would be taking the opposite stance- like, 'you are a criminal waiting to step out of line'- terrible! It could even have a reverse effect- like, 'they reckon I'm a criminal already, so why not do crime?' We still have the right to privacy to an extent, and having all our details on a database, microchipping us when we haven't done anything wrong, that be a huge violation of personal rights.

 Still, the biometric ID card will be similar to the system you are suggesting. We'll see if the crime rate goes down... Even if you have everyone on a database, who will monitor the people who monitor the database?