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Do you do it because arguing on the Internet/OCUK is futile as you are unlikely to change their opinion.
Why do you feel the need to change someones opinion? Some sort of moral superiority?
People will inevitably have differing opinions, they are neither right or wrong, they are just opinions.
Always makes me chuckle on this forum the amount of people who try and scream and shout down anyone who's opinion differs frome theirs, hell i've probably been guilty of it too