That's like saying that in modern-day U.S., the culture is "totally casual about people killing each other, any social class, no reason necessary," and justifying that by linking to a web page discussing the penalties for murder in present-day American law.
As that Wikipedia page will tell you, wergeld was a legal penalty for killing imposed on the guilty person. Today, punishing murder with fines sounds unusual (though perhaps not so much when you consider that wrongful death torts still exist), and this is indeed a sign of significant cultural change, but the idea that killing people was seen as an OK casual thing to do among the old Germanics, or any other historical people, is just ludicrous.
You're committing fallacy of reinterpreting past cultures in terms of your own culture.
Weregild was not a penalty, and had nothing to do with guilt. It was debt towards family to compensate for their economic loss with no consideration of "guilt" whatsoever. Wikipedia doesn't say so, but it was debt of extended family to extended family.
Thinking in terms of "guilt" doesn't even make that much sense to cultures that organized society in terms of clans or families instead of individuals. Such cultures used to be very common. Even as late ...
This is our monthly thread for collecting these little gems and pearls of wisdom, rationality-related quotes you've seen recently, or had stored in your quotesfile for ages, and which might be handy to link to in one of our discussions.