It's not about breaking the law, it's about the law being broken and therefore not a proper tool in a given situation.
Laws are like, well, like science for example. They're broad and generalistic pictures. Dynamics that can never have the same degree of resolution the relevant layers of reality have.
It's a little bit like uncertainty (or exactly the same if you know of anti de sitter spaces and holography a bit).. like a bell curve: The law is meant to work in most cases but the further away we get from the 'median and more likely case' the more likely it'll be that the law breaks down because of its too low resolution.
(a simili would be a microscrope that cannot see anything that's under say 0.5% of the median scenario, or how you cannot see the micro moves eyes make to get a better depth perception)
Then there's the 'complex system' bit, which to put it simply is about the butterfly effect.
Even if laws were optimal at some Time 0, which is most certainly not the case, as time goes on new laws are added, old laws are modified as the environment evolves. Each modification, substraction and addition will create complex chain reactions. The same thing is true of DNA.