I think free riders on US security spending is a bit exaggerated, considering the EU spends yearly 340+ billion collectively on defense, trillions over decades, including UK even more, and part of the money was always used to buy US equipment and support US wars, but it's true that the EU could have spent even more and Europe profited from US security guarantees. However, the EU has also carried the main burden of refugees from US-led wars, spending again billions on refugee support and is now solely funding the Ukraine war, which was partly provoked by US/Nato expansion.