I have no problem if you don't like r34 and I do think it should not be on dA. What I find irritating is when some fans think anyone who draws r34 is the spawn of freaking Satan and will end the fandom as they know it.
People keep complaining about "MLP IS A KIDS SHOW!" ......So? Welcome to the fucking internet. Ever heard of Rule 34? If it exists, there WILL be porn of it. NO EXCEPTIONS.
And not every brony who likes r34 clops, ya know? Sure, some of it can be extreme, but you can't stop it. You think you can? Good luck.