I agree with your opinion, but it is a known fact that companies search our history everywhere. For example, some companies search in health databases to exclude people that have health problems (like diabetes...). Imagine that a company wants to hire a system administrator and they find out you've been charged for illegal content download. The company could say "hmm, this guy might use our resources for illegal stuff". It doesn't mean others can't do the same, but the fact that they know you did it with your own resources makes them think again.