Getting infections in the eye is not a 'trait of the species' it means that your animal is sick, no matter how you look at it. Sure they might be prone to them, but it still means they're sick.
Animals with curly fur, are also prone to eye infections, are we going to call that a 'trait of the species' and not treat them? No.
At the very least, warm compresses and anti-biotics can solve your problem. Anti-biotics are cheap, and easy to administer, and if your ASFs are even slightly handleable, you should be able to hold them still long enough to clean their eye, administer medication (wether it be in the eye, or orally), and hold on a compress for a minute.
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