How come cockroaches ignore zombies? aren't they carrion creatures?

I can understand why zombies might ignore small insects (even though the cockroaches are the size of a dog) but why the heck are cockroaches so viciously aggressive (the fact they’re classified as “minimal” threat is a lie considering how quick they are, can easily cause bleeding, and always travel in swarms) against breathing humans, but completely ignore zombies? Wouldn’t it make more sense for them to try and eat zombies considering they’re carrion creatures?
Either they should be alot more skittish (like cockroaches in real life, especially when exposed to light) to humans (instead of even more bad tempered than moose), or they should try gnawing on zombies. Its not like they’re smart enough to know they’re poisonous, considering how much other literal crap they’ll try and eat…

现版本处理僵尸的尸体只有6种方法:
• 酸雨腐蚀
• 火焰燃烧
• 工具回收
• 车辆碾压
• 土地埋葬
• 自然分解
增加第七种方法?
• 动物(昆虫)食用…
我认为除了真实性外并没有任何必要
或许可以大胆的假设,僵尸和变异昆虫已经形成了统一联盟?所以不会“攻击自己人”,即使是尸体,或许会有一个更合理的解释。

The in-universe explanation is that insects are somewhere on the “blobby” spectrum, the same way still-living humans can be both ferals and normal survivors. The out-of-universe one is we don’t have a faction relation for “ignore until they attack, then engage/flee”, so reciprocal neutrality is the closest we can get at the moment.
Their aggression is a bit overblown, but that’s an easy adjustment for whenever.

Wasn’t becease zombies will ignore any monster under a certain size limit (this is why you don’t see them attacking birds, rats, fish and small mamals anymore) and the cockroaches just happen to fall in that size range. They seem to attack other insects just fine to.

The reason they ignore each other was - as far as I remember from one pull request - that there was too much fighting going on between all the animals and Zombies in a city, so they were made to ignore each other…

Edit:
Well, small correction… I found the pull request and spicyshadow was correct:

Also, take a look at this topic, some of the discussion is similar to here:

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I can’t honestly think of what would be “too much infighting” in this game… I’ve seen some pretty messy fights between packs of animals in the woods and zombies

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this may be a bit off topic, but if giant cockroaches were multiplying at the same rate as their smaller brothers in the real world, then I’m sure that in a few years the main danger will not be zombies or mushrooms, but all-consuming swarms of cockroaches. Those cockroaches that we meet in the basement can be either American or brown cockroaches, they multiply quickly, and in truth quickly, but estli to judge by the cockroaches in the game-they are more like Madagascar cockroaches.
madagascar cockroaches are large, have shorter legs, are not super fast and are much less prolific, although these guys are already territorial and protect their offspring, and do not run away in fear when they see you, hence you can take aggression. however, it is precisely the Madagascar cockroaches that do not really like humans as a source of food and at home, they are more fond of forests.

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if you look at the ants, you can understand that the mutation in the cataclysm significantly increases the ability to reproduce, so if this post is read by some bored mod creator, we can get an enemy scarier than a horde of zombies