Okay, so the Companions made a pact with the Glenmoril Witches. They would serve Hircine in return for power, the power being lycanthropy.
Hircine, the Glenmoril witches, neither of them went to the Companions. It was their decision to make a pact with them, and to be blessed with lycanthropy.
The Glenmoril Witches are not bad people, they do cures for free (though sparingly) the fact that Kodlak’s idea was to just kill them and be done with it is so stupid. Especially after he just tells you not to needlessly slaughter people.
Kodlak is a hypocrite. A huge hypocrite.))