We always want what's best for anyone that we care about so we want them to see the light, so to speak, when we know a better way. I have found though that when you try to force your will or opinon or knowledge down someone's throat they often rebel. And instead of educating you end up turning them further away. You could try telling them what you know and that you know it to be true and why but I wouldn't force them to accept the information until they are ready to because it may end up damaging the relationship. That's my two cents anyway.
Ivy