Why? Because they win?
If so then it is like the dumbest reason to hate someone (not to mention "hate" is a really strong word, you should hate your dictator instead).
I wish the other teams where better, but that is not the fault of Astralis - it is not like they are cheating like Russia athletes.
What do you want, for Astralis to lose on purpose, to me that would be really stupid.