Jennifer Lawrence might disagree with your laissez faire attitude.
The statement "there's not much to complaint about when those 3rd parties f* up, if you used them voluntarily." taken in general can refer to pretty much everything we encounter in everyday life. There are lot of implicit contracts made, and breaking some of them could be recognized in court (there's the concept of acting in bad faith).
In this particular case, JenLaw et al. have all the rights to be mad at Apple because of the broken ToS/implicit contract that said "this is my data, it's only backed up and will not be shown to third parties". Whether or not they have shown practical wisdom by using the service is a whole another matter.
That's basically the crux of disagreements around the "victim blaming" concept. People confuse two different things here - morality of whether something should be done, and the probability it will happen in practice. If I get mugged under the bridge in the middle of the night, I'm not morally at fault for being mugged (it's something that shouldn't be done), but I also haven't shown practical wisdom by going alone at night under the bridge in dangerous area (by doing so I increased the probability it will happen to me).
The original sentence becomes "Jennifer Lawrence shouldn't have stored sensitive information externally without using a minimum of good security measures" in this vision.