Internet is a double-edged

Internet is a double-edged sword, we will accidentally fall into the trap of it.
Internet at least three harmful effects: First, the Internet has the impact of the study and the abolition of their studies. Second, the Internet seriously damaged our health. Third, the Internet allows us to express a lack of live efforts.
But you never say a knife is not good while it cuts your hands. if you grasp the handle, is it not very useful? The benefits of the Internet it is enough to bury the harm.