I will take your word for it, as I am judging by what I have seen on HBO.
If what you say is true, than HBO is doing a grave disservice to the author by changing the entire tone of the work.
As far as that goes, yes it is a disservice. Someday perhaps someone will produce an edited version that is PG-13 and not MA. That would much improve the thing.
The HBO series is very much an “adults only” product, that on occasion (perhaps once or twice per episode) goes far outside the material to insert its own unique “extras”. Only 5% of that, if so much, is in the books. Even the plot gets tweaked. The explicit homosexuality of a couple of characters on HBO is merely very marginally implied in the books, just as an example.
On the other hand the other aspects of it are very well done and in some ways improve on Martin. The fellow badly needed an editor.