Furthermore, if somebody in the government wanted to "ruin" a political enemy, all they would have to do is break into that persons home and "plant" child porn on their computer. Then an anonymous tip will bring the cops crashing their door down and how could you possibly defend yourself against that?
What if a bank robber dropped your stolen billfold while committing a bank robbery? Do we allow bank robbers to go free because they may blame the robbery on you?