If you hear from a member of group X that group X says Y, it is usually true.
If you hear that group X says Y, from those who do not like group X, it often true.
If you hear that those who don’t like group X say Y, from those who don’t like those who don’t like group X, it is seldom true.
If you hear from a member of group X that group X says Y, it is usually true.
If you hear that group X says Y, from those who do not like group X, it often true.
If you hear that those who don’t like group X say Y, from those who don’t like those who don’t like group X, it is seldom true.