Do you think impaling children is good?
Vikings put babies on spears.
In the Icelandic Landnamabók, which tells about the times and people during the settlement of Iceland by the Norse around 870-930, the nickname of a certain Viking is told:
>Ölvir barnakarl hét maðr ágætr í Nóregi. Hann var víkingr mikill. Hann lét eigi henda börn á spjótaoddum, sem þá var víkingum títt. Því var hann barnakarl kallaðr.
<Ölvir child-man was the name of an excellent man in Norway. He was a great Viking. He didn't impale children on the ends of spears, as Vikings used to do. That is why he was called child-man.
That is a good question and one that scholars debate over for every single text.
As for the landnámabók (book about the settlement), it is relatively old. Written only about 100-200 years after the settlement and around the time when Iceland officially became Christian, that means in that time pagans were still around. There exist several copies of the landnámabók, showing different degrees of emphasis on Christianity. That doesn't guarantee pagan or christian sympathies of the author, but the probability of it being free of Christian bias is higher than in later medieval texts and the authors were certainly more familiar with the topic.
It is possible that the story of Ölvir barnakarl was exaggerated to make pagans look bad. It is also possible that it really was like that sometimes. We can't be 100% sure, but from what I've read in Old Norse sources, this level of violence was at least plausible. If you look at how viking raids were described by Britons, for example, you also have to take them with a grain of salt but they speak of insane amounts of violence. Let's not forget that we know for a fact pagan Scandinavians practiced killing of their own children in certain cases and Germanic tribes were known to sacrifice humans in desperate times.
But the truth is somewhere in the middle. Many viking trips didn't result in raids, they were just trading trips. Sometimes they practiced extortion, but sometimes they did raids. Surely some raping and killing and putting babies on spears did happen at least once or twice.
Good Christian Icelanders also literally bashed each others heads in with rocks during disputes about the power of local chieftains vs that of the church.
>The Battle of Víðines (Icelandic: Víðinesbardagi) of 1208 was a conflict that took place between secular and clerical forces in early 13th century Iceland.
>The Catholic bishop Guðmundur Arason had defended the exclusive judicial powers of the Roman Catholic Church over its clergy against the secular powers of the goði chieftains. In 1208, Kolbeinn Tumason and Arnór Tumason of the Ásbirningar clan and Sigurður Ormsson of the Svínfellingar clan advanced on the see of Guðmundur Arason. They wanted the bishop to give up several men in his assembly with whom they claimed they had rightful business. The bishop stood by his claim that the clergy should retain judicial power in its own affairs, and a conflict ensued at Víðines, near Hólar, the seat of the bishop. Kolbeinn Tumason died in the battle, his head bashed in with a large rock, and the clan troops dissipated. Before he died, he composed the poem "Heyr, himna smiður" (Hear, heavenly creator"), which is a classic Icelandic hymn to this very day.
https://en.wikipedia.org/wiki/Battle_of_V%C3%AD%C3%B0ines