The "brain trust" thinks Europe is a bunch of freeloaders, reliant on the US for their security, but disgusted at how the US provides it. The Greenland/Canada thing is intended to force Europe to build up its militaries.
It is also serving as a distraction to the shooting war they are trying to start in Central and South America.
Outdoor trades tend to start work around 7am, when noise ordinances are lifted, and knock off a couple hours after midday, to avoid the heat of summer. With midday at 11:30, summer sunrise was three hours before they could even start their work. All those cool morning hours, perfect for hard work, completely wasted, while workers suffer heat exhaustion in the afternoon.
Fortunately, we have only rarely used legacy time in summer in the past hundred years. We've built our legal and industrial infrastructure on the premise that solar noon will occur sometime between 12:30 and 13:30 local time for 8-9 months of the year.
Maintaining that historical expectation with permanent summer time will greatly reduce the transition to a "locked clock".