> Why should an ISP provide proof of the good behavior of their clients ? > Or in your conuntry you're considered guilty until proven otherwise ?
This is not a court. In court, if you are determined guilty a large punishment may be exacted (note: it's innocent until determined to be very likely guilty in criminal cases, innocent until probably guilty in civil cases); here, that is not the case. They have a history of abuse; it's fair to be suspicious of them (why did they let the abuse last so long?) and ask for an example of a legitimate client. If they have a few, it should be easy to find one willing to be used as an example.
