Of course, it is you right to agree or disagree.
But it seems to me that you are judging a poet by only one of his poems. (Yes, one poem may be enough to feel that the poet is very talented - and to start looking for his other pieces, but it is probably not enough to dismiss him completely. But it is my opinion, of course.)
Just for the record, "The Crocodile" is an excerpt from the book "Dirty Beasts". Since I've never read - or seen - the whole book, I cannot say for sure if it has a point and what it is.
As for the fairy tales, if you prefer those, you should probably check out "Little Red Riding Hood" by the same poet - I posted the link earlier. It has a "point at the end. Good guy gets it all." You might even like it. Roald Dahl, apparently, had rewritten many fairy tales.
Can lots of this at young age hurt in future?
Probably, just like lots of anything else. Why there should be lots of this, or anything else? A child should be exposed to a variety of experiences. And of course, at an appropriate age for each one of them.
As for the fairy tales, and I am not talking only Grimm brothers, they are, in a way, a controversial kind of art. You should take into account the following points:
1) Many fairy tales were not initially intended for children at all. Not all of them have a good ending. At some times in the history, it was also not considered a bad idea to tell children scary tales with a bad ending. A lot of tales printed nowadays are adapted for children, according to modern beliefs.
2) As for "good guy gets it all", in some tales so much cruelty is happening on both sides (in some cases even practically unprovoked), that it could be hard to tell who is the good guy here. Sometimes good or bad guys are distinguished only by the author's initial idea, or just "poor is good, reach is bad", and so on.
All of the above doesn't mean that I am completely against fairy tales. I just screen them for appropriateness, just as about any other reading material for children. Later in life, though (each child might have a different age for this) children can read a wider range of books and pass their own judgment.
And the fact that I liked "The Crocodile" doesn't mean that I am ready to read it to a young child at a bedtime right away.
It meant that I started a research on the author, and found many different pieces, both appropriate and not, and learned a lot myself (and some of them you, too, may find, do have a point). But I probably will look for age-appropriate children’s books of this author in the library or book stores. Because children should also read/listen to talented books, not just any mediocre book with a point.