Earlier quoted context omitted.
The EU should force a carbon tax on plane fuel for intra-EU flights and subsidize rail with the money.
The saddest part of this statement is that the European rail system is MASSIVELY subsidized even at the price points that the person you responded to described as "paying out the nose", which of course is a somewhat subjective position for a European to say, because their already lower salaries are massively taxed and to pay for the subsidized rail systems the gleeful Americans can gush about being so cheap when they…
I really don't think European public transport is the major force driving young Americans to the left. I hear a lot of young Americans who (quite rightly IMO) look at socialised healthcare in the EU and wonder why on earth they can't have it back home ... but that's a separate issue altogether