Is it safe to allow cyber survelliance without proper legal process such as judical oversight?
This is, of course, a matter of opinion.
My own view is that it is not "safe" to allow cyber surveillance without judicial review. This is similar to the case that was just decided by the US Supreme Court in which it ruled that the use of GPS trackers to track a person's car was illegal without a warrant. The same principle applies to cybersurveillance.
The amount of information that could be collected about us through unlimited cybersurveillance would be truly frightening. The government would be able to know essentially all about our interests and might be able to gain information about such things as our health and our financial situations. While it is true that most people would have nothing to fear if the government knew such things, it would still be a great invasion of privacy. We do not want to allow that to happen unless the government has a truly compelling reason for gathering the information.