Why would it be dangerous to meet "internet friend"alone?(用英语回答)

The internet is a place where nobody knows nobody.You would never know whether the 17-year-old girl you are talking to this minute will become a pervert the next minute.Meeting internet friend alone is certainly dangerous,as you don't know who you are meeting,whether the person is good or bad.You might just fall into a dangerous but invisible trap and by the time you realise it,it will be too late.Therefore we should not meet internet friends at all,or if there is a necessity,it is best to bring a friend along and meet at somewhere with many people around,to ensure safety.
会不会太短或太难?我不知道是什么级别的.