Keep in mind this is a report from a Think Tank (which is not funded by individuals but rather by organisations with a certain political slant) rather that some kind of peer reviewed scientific paper.

(The Guardian is pretty big on presentings Think Tank reports, which are almost invariably "opinion making" pieces, as "the way things are")

I'm involved in politics locally (in Portugal) and whilst most of those things are indeed important concerns of people, you would be hard pressed to find anybody for whom any one of them is such a higher priority versus the other that they're 'tribal' about it - generally people have a bit of each as a concern.

Also were in this report are represented concerns such as Corruption in Politics or Human Rights (specifically with what's going on in Gaza)?!

That report reeks of selective framing.

I've lived in the UK and this report looks a lot more like how politics is fragmented over there, which is mainly because that country has no real Leftwing beyond the Green Party (which gets about 1 million votes out of around 40 million) since Labour became New Labour, and even this newspaper is "the voice of the neolib" and only sounds sane by comparisson with the rest of the media landscape over there (were most newspapers would long ago already be deemed far-right by the standards of the rest of Europe), and even there I would say it's more the product of Press and Politicians framing it in a certain way for "opinion forming" purposes - in the absence of left vs right, stories had to be spinned to make politics seem representative - rather than these things being genuinelly some kind of "tribalist" boundaries.

I would be very very wary of taking any Think Tank report on politics at face value or The Guardian's view on the rest of Europe as anything but highly poluted by a British exceptionalism, projection and misunderstanding, and I say this as somebody who read that newspaper for almost a decade and has lived in a couple of countries in Europe including the UK.