Where files and documents only are valid evidence, why arrest and harass without first filing detailed charge sheet and proving case ina court of law?

The difference between white collar crimes involving finance and assets , and other criminal acts like murder /assault / rape etc, is that, the former are all leaving audit trail in files and documents and once those are seized after a raid , that will be the only evidence admissible in a court of law and nothing else. Any oral statements of any one involved claiming innocence or some one forcing to make them do what they did, do not carry any weightage in the eyes of law. So in the name of inquiry using the provisions of Cr.PC arresting and spending thousands of hours putting questions to an alleged white collar criminal , to my mind has no meaning. It has only a harassment value. I do not think that is the spirit of the law.
Then I find it hard to believe, the bail getting refused, routinely in the name of the alleged accused may tamper with evidence or threaten witnesses. It may be true for hard core murderers with large number of cases. But not for white collar crimes. Because it is based on documents and not on oral evidences of witnesses etc.
Time to reconsider the way the provisions of conferring vast powers on the inquiry officer under Cr PC, in case of white collar crimes. To me it appears brute force taking the place of intelligent investigation by research and making a case. Sri Swamy is doing it.

Brute force of arrest and jailing for interrogation may work other criminal cases like murder, rape but it has no meaning for cases where files and documents only stand as valid proof. It is a matter of inteligence and fine research and analysis!!