Why do you feel like the owner of a Catholic forum should not ban pornography? What relevance has it to the topic - why should he allow users to be disgusted, scandalised and put into occasions of sin?
He
can ban it.
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But, if a pornographic image is the only way to explain something that words cannot explain, then the owner should choose to not ban it, to allow the conversation to develop. If he does not want the conversation to develop, that is another matter.
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Personally, I believe that we should have as many controversial conversations as possible because today the new "radicals" are the traditionalists. Today who suffers most from de-platforming and censorship are traditional conservatives!
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I was banned from a webstie for asking that all candidate nannies would teach Catholic precepts to my daughter and refrain from offering influences contrary to the Catholic precepts.
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We are in very dangerous times where censorship is used
against the Catholic Church. It is extreemely dangerous to allow
any form of censorship because we cannot pick and choose what to censor and what not based on our Faith because we live in a free world: we cannot hope to enforce freedom of speech only for Catholic ideas and censorship only for heresy and error.
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Given reality (i.e. we live in this context) it is preferable to allow
all free speech rather than allow states to regulate it.
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I would agree to censorship, according to Catholic doctrine, if we lived in a perfect Catholic world. Given the special and very dire circuмstances, like Cardinal Lefevbre, we must act out of necessity and violate a doctrine that supresses free speech to preserve the freedom to protect and talk about our Faith.
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Regulation of free speech on all platforms is a must. You'd hardly also argue that the owner of a children's TV channel should not ban pornography? Now, we aren't children, but it's still harmful and not at all relevant to us too.
I like this example because it offers the opportunity to discuss context.
A children's TV channel is constrained by the channel owner interest. If the channel owner publishes pornography on a children's TV channel, very soon parents will not allow children to watch it. Owners of other channels, who seek different audiences, in fact do publish porn.
Similarly, the owner of this platform will determine what audience he desires.
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If the owner wants to protect Truth and the Church then, I believe, he should allow lies to be published so that these lies can be demonstrated such and proven wrong.
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If the owner wants to protect an depth discussion, exlucively amongst individuals who already agree on certain matters then he should not allow lies to be published as these distract from the scope of the platform.
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Now, we aren't children, but it's still harmful and not at all relevant to us too.
Of the harm of lies in this context I am not certain.
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In this context I believe that they are relevant because viewers can benefited from lies been exposed and proven wrong. I, for one, found rgeater convition reading why the lies were wrong than simply when members stated that they were wrong. The exercise of proving them wrong was beneficial to me.