Though I feel no particular obligation to do so, I'll bite. I don't necessarily consider myself a "clopper," and am not overly fond of labels in general. That being said: I think female cartoon characters are often attractive (to me) for the same reason irl women might be considered attractive. My inherent and inextricable tendency to gravitate towards certain "feminine" qualities (present in their appearance and / or personality); flowing, appealing curves, long eyelashes, relatively higher pitched or softer voice... Granted these are arguably stereotypical qualities / no woman is merely the sum of these things, and I think beauty and attractiveness do not exist in but a single, fixed form. But let's examine cartoon ponies, specifically. I practically regard them as quadrupedal anime girls (those big, gorgeous, emotive eyes) that - let's face it - don't seem especially hung up on the whole wearing-clothing / avoiding indecent exposure type stuff. Long, colorful manes certainly don't hurt. And sometimes even the show itself comes off as a veritable parade of pony butts lol.
Having said all this... I'm not entirely sure what I'm meant to persuade you about. If it's whether attraction to one thing or the other is right or wrong... Morality doesn't and shouldn't enter into it. It is neither wrong nor right to be attracted to something or someone. Condemning someone for being attracted to a fictional, colorful pony girl is rather silly and pointless, in my opinion. If anything I wonder... Why are people that find it odd / weird / disturbing seemingly so intrigued by it lol? I haven't been especially vocal about such attractions until fairly recently, but I've seen outspoken detractors voicing their opinions aplenty. I've no particular interest in hurting you or anyone / anything else. I fail, quite miserably, to see how my existence would pose a threat to anyone. I would never "attack" a stranger with explicit material or share - in exacting detail - any fantasies I might have. Or, rather, I'd need a pretty damned straightforward invitation to share anything even remotely explicit (and, even then, would likely be hesitant to do so). I'm not here to convert, harass, or cause discomfort; though I'm not clear as to your motives.
I hope that I was able to express my feelings in a way that was neither inflammatory nor offensive.