The second personal pronoun came from two Early Modern English words: "thou" and "ye". "Thou" was singular and "ye", plural. They have now been replaced by that one word "you" and that's probably how this came to be.
What I interpret from you saying "people in general" is probably in such a case:
The first "you" in the first sentence refers to my friend.(in reply to a friend who just told me the fallacy another friend made) "Yeah, I know what you mean. Bob was wrong to have done that. You can't just give someone your hard-earned money just because he claims to be your long-lost brother..."
The "you"'s and the "your"'s in the third sentence refers to people in general and definitely not my friend.