A 2009 study in the Clinical Psychology Review (which unlike yours is peer-reviewed), using data from 65 studies across 22 countries found a 20% rate of abuse among young females, and an 8% rate of abuse among boys. In America, the CDC and DoJ estimates that 4% of boys and 11% of girls suffer sexual abuse as children.
http://journalistsresource.org/studies/government/criminal-justice/global-prevalence-child-sexual-abuse/
I find it rather telling that the only evidence you can offer is from an extremely biased, non-peer reviewed political activist group. You also offer anecdotal evidence, which has two problems:
First, for every one of your abusive scoutmasters, I personally know (at least) one gay man who has no interest in interfering with children. The same applies to anyone who actually knows gay people or anything about homosexuality.
Second, I am skeptical about your ability to correctly identify abusers. You cited Peter Tatchell as an example (and you've only actually given one other concrete example), and you were completely wrong.