Here is a tricky one. When you read something like this, you usually end up with a huge question mark on your face. It seems that the FBI has been using spying programs in order to collect information about users on several websites and forums with the alleged pedophile content.
This is how we get to the point that unjustified means are being used for the justified cause. You do not have to be a rocket scientist to probably know by now that the Internet has become the most popular hideaway place and sharing mean for all kinds of cyber pedophiles. The FBI is definitely not an exception in this case.
However, the use of unauthorized or even prohibited methods in fighting some of the most troubling forms of crime is a little bit problematic. We can argue as long as we like. Pro et contra argumentation between the two parties with the opposite points of view will probably confuse you even more.
We are not saying that some of the pedophiles with a criminal record should be granted with an opportunity to sue the FBI. On the other side, the FBI and similar agencies should not be discouraged in their rightful efforts. Some acceptable modus has to be introduced. But how? We are not quite sure about?