This is actually one of my hot buttons. Anybody can write an editorial, but if there's no underlying analysis, it's just an argument.
Lots of maths in the FT and the Econo. It's not like they ever pull an argument out of thin air and try to make it convincing by repeating it over and over, even if it's nonsense.
If you're looking for quantitative support, consider:
Of course, apart from all of those - and it's not a complete list by any means - there's no evidence of a problem at all.