The European Union's, obviously.
The natural philosopher's understanding of historical and economic forces d oesn't seem to be wonderful, and his idea that the EU has got everything wr ong isn't exactly plausible.
There are political protests going on in various members states of the EU, but the protestors are angry with their own governments - as a opposed to t he EU as a whole.
In much the same way, and to much the same extent as the UK is absolutely g uaranteed to fall apart into England, Scotland, Wales and Northern Ireland, with a high chance that England itself will split into the Home Counties, the North and the West.
Former Yugoslavia went that way, and Czechoslovakia is now the separate Cze ch and Slovak Republics. Of course they are all still members of the Europe an Union.
The Brexiteers were gullible enough to believe the twaddle they were sold, which makes them remarkably stupid.
The yellow-jacket protesters in France aren't object to the EU, but rather to the French governments habit of raising its tax income by regressive rat her than progressive taxes - the price of diesel fuel has gone up 25% in a year, but only in France, and largely because Macron jacked up the tax take .
Disproof by assertion? The EU was the UK's largest trading partner - puttin g up tariff barriers between the UK and what used to be its largest trading partner isn't going to do the UK any good at all. It won't hep the EU eith er, but the EU is a whole lot bigger than the UK.
Except that the EU is no sinking Titanic - it's doing fine, and will keep o n doing well without the UK.
The natural philosopher's idea of a "substantive point" is one that he find s convincing. His judgement isn't impressive.