It would be helpful to know what exact statute they were found guilty under, what the facts of the case were, and what the reasoning of the judge was, if any was given, for the exact sentence given. Without that information, it’s hard to really judge the fairness of the sentence.
(Also, being eligible for either parole or early release within one year isn’t exactly being given a one-year sentence.)
The United States has some of the harshest and longest sentences for criminal offenses. Just because the news shines a spotlight on the potentially shockingly short sentences, doesn’t mean that’s the norm.