Attacks are underreported and surveys often depend on what questions were asked and who responded.
Speaker John Boehner addressed this in an underreported but excellent speech at the American Enterprise Institute on September 19.
An underreported part of the Iranian protests is that women are leading the way.
One reason, studies show, is sexual assault and rapes are underreported.
Likewise, voters are split by party as to whether sexual harassment is overreported or underreported.