No, it is not disingenuous at all to take offense at that statement.
The mental shorthand used to blithely equate criminals and Soldiers betrays what the author really thinks about members of our military. That is, 'they are mostly aggressive young men, aggressive young men commit most of our crimes, therefore Soldiers must commit most of crimes.'
It is that sort of thinking that leads people to make statements like "If the military has trouble finding recruits, we should give our judges a sentencing option to put convicts into the military and solve both the recruiting problem and prison overcrowding problem." (An actual statement made by an undergraduate student at Northeastern University, which was met by general assent in the class, including the professor) That's just in my personal experience (frustrating!).
The attitude is born of ignorance about who joins the military and the difference between volunteering to serve and being arrested, tried and convicted. Also, ignorance of what it means to be "trained in warfare." Having been through various training and actual warfare (Army, 2001-2009) I can confirm that there no training that includes murdering unarmed people. The author may suggest: "What's the difference, shooting people is shooting people?" I'd answer: "We expect everyone, not just Soldiers, to know the difference between murder and self-defense and act accordingly." We do not train murderers.
It is no different if had the author stated: it is reasonable to expect a higher crime rate around historically black colleges because of the dense population of minorities there. So, yes, it is offensive. But, kudos for finding the truth about our military members and plainly setting it out in the article.