Language is a human capacity, so in fact there MUST be universal laws that govern it (to be more specific, this is true of human languages; aliens could have entirely different languages, but for any particular alien species, there will have to be some laws of the structure of that species' language).
How do you imagine language could develop (both evolutionarily and within each child that learns it)if there were no predetermined laws that restricted the set of possible word combinations? As Chomsky would say, if you think about it for a while, you will see that the alternative actually makes no sense.
That is not to say that the laws that Chomsky has identified must be correct. He could even be wrong about searching for universal laws at the level of grammar. But he has shown conclusively that there must be some universal structure that underpins all natural human languages.