I thought the 2008 debacle was triggered by mortgage derivatives speculation, encouraged by US brokerage houses such as Bear Stearns, Lehman, and Merrill Lynch. My view is informed by books such as "The Sellout" (Charles Gasparino, and "The Big Short" (Michael Lewis), among others. The Europeans certainly participated, but the creation of these dodgy instruments was mostly a US innovation, encouraged by foolish government rules on housing (such as the Community Reinvestment Act).
Whatever the reason, if our getting out of European matters also leads them to clean house on their Muslim infection, I'd view it as a positive. We can kiss and make up later... or not.
The bigger reason was actually the European Central Bank raising interest rates.
Not to mention, there are already plans in place to deal with the Mahometan “infection”. The EU rules by crisis. If the USA gets out, they get to build themselves into what they planned to be all along, that being an enemy of the USA.