It wouldn't be my first choice for convicting a guilty person, but if it was one of my family who'd been robbed, hurt, raped or killed I don't think I'd be precious about it.
Isn't that the whole point though? Which came first - the chicken or the egg?
You and others are providing the relatives with excuses - when there is no guarantee in the
first place that they were correct in their suspicions.
They will try to blame police and possibly Mugford, for the wrongful conviction. Without the relative's intervention - there would be no wrongful conviction.