Did you expect it to be easier than solar system exploration or what? The engineering problems have plausible solutions: You'd need a lot of water anyway so a shield of ice can handle debris, the ice, together with the ship's own mass, also shields radiation quite a bit.
This is pretty different from a "fairy tale" and not addressed at all by the blog posts you used as arguments.
This is pretty different from a "fairy tale" and not addressed at all by the blog posts you used as arguments.