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人が個性について語る場合、どうもいい個性のことばかりを取り上げているように思う。いい個性は伸ばし、悪い個性は直しましょう、というわけだ。しかし、私にとってはどちらも大切にすべき個性であるし、そもそもこうしたものにいいも悪いもないのである。
I don't know what the sentence "そもそもこうしたものにいいも悪いもないのである" exactly means. I can only guess its meaning from context, that "this kind of matter is not something that can be described as good or bad".
This に is an (abstract) location marker used with ない (and existence verbs such as ある and いる). Here, いい and 悪い are used as nouns.
こうしたものにいいも悪いもないのである。
There is no good or bad in such things.
こうしたもの refers to 個性, so the author is saying that there is no such thing as "good personality" or "bad personality" to begin with.
