but all men who molest little boys are committing homosexual acts.
No, they are not committing homosexual acts, they are committing sexual crimes against a person. Homosexual acts occur between two consenting adults who like performing sexual acts with people of the same gender. There is a big difference.
But yes, homosexuals are over-represented in reports on child molestation. It is because people classify any act between two people of the same gender, regardless of age and type as a homosexual act. To see why this is wrong, or inaccurate, read my previous statement on what a homosexual act is.