No one else is claiming this stops all or even most STD's. Why are you making this claim?
These shots are being given to children as young as 11.
Do you suppose when you tell a young girl, “This shot is to prevent HPV.” that she is not interpreting that as:
A) Permission to start having sex.
B) Notice that she doesn’t have to worry about contracting an STD, and conflating that to infer it protects more than it does.
Do you suppose that qualifies as: “...provides a false sense of security, regarding all STD’s.”?