Gay marriage is not something I would 'die in the ditch' over opposing it. I would prefer it didn't happen but If Parliament, in its wisdom, votes to allow it sobeit.
But Garth McVicar does little to assist the cause of those opposing such a move when he suggests that Gay marriage will lead to an upsurge in crime. The report is here His argument is emotive and not, I suggest, factually based. Certainly if there are statistics supporting such a contention he didn't advance them
There are better arguments to be made in opposition to the move and the 'anti' lobby would be wise to concentrate on those rather than have them weakened by being linked with the McVicar view ... guilt by association and all of that.