I don't think that Apple suing to protect its intellectual property is wrong. But even if I did, I don't buy the logic that doing the 'wrong' thing is okay because the other guy did it first.
Apple is waging a war by proxy on Google via attacks on Android handset manufacturers. They've mostly avoided direct engagement so far (which is smart, since Google isn't the one making money directly from Android), but it's obvious to anyone watching the overall swing of these lawsuits that Apple isn't waging war on HTC or Samsung as much as they are on Google and Android.