Short inter-city distances over land run into competition from high speed rail. Which I know is not a thing in the Americas, but is all over Europe and can compete with turboprop airliners on point-to-point time. (Remember, railway stations are almost all in the centre of the departure/arrival city and there's no security theatre to delay your boarding: also, service frequency on some high speed inter-city routes is as high as one departure every fifteen minutes, utterly unlike Amtrak.)

Scotland isn't really a market for short distance electric flights unless you're thinking of the Highlands and Islands, where less than 10% of the population is scattered across crinkle-cut fjords.

France/Netherlands to Sint Maarten/St. Martin is, IIRC, served by wide-body airliners because it's both legally part of France itself (at least the St. Martin half of the island) and it's a significant tourist resort.

And if you think the EU and UK have laxer safety/regulatory standards than the FAA, you might want to re-think your position ...