Yes, it necessarily IS a good thing for cooperation to be reduced: the FAA has proven that it cannot be trusted at all for airplane certification. The EU needs to stop trusting the US for anything at all, and start doing more for itself.
When the US elected Trump, that should have been the signal that the US could no longer be relied on. Of course, there were many signs and problems before (like when W. Bush was elected and started 2 wars), but Trump being elected should have been the obvious last straw.
Less cooperation between the FAA and EASA is not at all good. The whole reason aviation is so safe these days is because we've had good international cooperation from the beginning. The correct answer here is to work together to build/rebuild trust as necessary.
No, it's not, unless you're somehow going to wipe out all the leadership of the FAA and start all over. That obviously isn't going to happen any time soon, and "we're sorry" isn't going to cut it when the FAA is obviously more interested in Boeing's corporate profits than passenger safety, so they simply cannot be trusted again any time soon.
Trump was inaugurated on January 20, 2017. The 737 MAX was type certified by the FAA on March 8, 2017. That seems like rather a stretch to blame the 737 MAX certification on Trump's election.
Oh, I'll agree that Trump's election shows that there are problems. It just doesn't show that there are problems at the FAA. And the 737 Max shows that there were problems at Obama's FAA.
When the US elected Trump, that should have been the signal that the US could no longer be relied on. Of course, there were many signs and problems before (like when W. Bush was elected and started 2 wars), but Trump being elected should have been the obvious last straw.