Members of disliked minority groups are often stereotyped as representing a danger to the majority's most vulnerable members. For example, Jews in the Middle Ages were accused of murdering Christian babies in ritual sacrifices. Black men in the United States were often lynched after being falsely accused of raping White women.

Jews did murder Christian babies, they still do today.
And blacks do rape White women.

In a similar fashion, gay people have often been portrayed as a threat to children.

Okay, considering the first paragraph that blacks and jews AREN'T a threat, then it stands to reason that gays in fact are a threat to children.