if adults, in private, enjoy 'unconventional' sexual activities, what the fuck has it got to do with you or anyone else? Might as well claim it would be better to 'minimize the chances' of people developing a keen interest in train spotting, or astrology, or cycling.
But none of this is private. If it was private, no one would know about it, would they? I am really starting to think that a lot of people don't actually know what private means.
Ultimately sexual norms are never completely private, that's what makes them norms, there is always an intersection between what's culturally normal and what people do in their "private" lives. People do not just "privately" come up with the idea of focusing their sexuality on giant fake fur animals, along with 20 other people in a club. Sexual fetishes are developed through experiences that happen at formative sexual periods, and a lot of these group ones are through porn or exposure on the internet.
Is it good for society overall to have large numbers of people with fetish focused sexualities - not particularly. It's not good for a lot of individuals either, it represents an interruption of what would have been their normal sexual development in a way that will narrow their opportunities, and in a lot of cases encourage escalation.
Those are good reasons to have a social norm whereby fetishes are in fact private, not something you do in public or a public setting, and that includes the media. No one is coming into your bedroom to check on this stuff, but Pride, and kink festivals, and porn, are ultimately communal spaces not private ones.