If you are looking for more educational or scientific information, those sites are polluting the results on search engines. Very often when you want to look for some information, something like a good in depth explanation of something, you spend hours surfing from site to site before finding a few good one pages. Some people suffering from a high level of paranoia, gather together in order to spread scaring information and contaminating other people. Others forget to update their information. People who seek to take some revenge or having a too big fantasy can publish whatever comes to their mind.
Misinformation is worse than non-information or superficial information .
Porno-sites are totally free and uncontrolled. Like many commercial sites, they want to make money without taking into account the consequences of their acts. Porno sites are worse than commercial sites, because surfing children can visit their site. No real protection exists. There is no barrier.