They actually don't want that backdoored, guaranteed.
An even more egregious example : https://news.ycombinator.com/item?id=39918245 Facebook-Meta and Whatsapp maybe accessories to warcrimes perpetrated on a massive scale.
https://news.ycombinator.com/item?id=40063025 ("ChatControl: EU ministers want to exempt themselves (european-pirateparty.eu)", 202 comments)
BTW, install your own XMPP server and use OMEMO-compatible clients - Conversations on Android, Gajim on desktop - and you get to have access to non-surveilled [1]communications just like those politico's.
[1] assuming that your client and server devices remain uncompromised, not a given if you happen to be a high-value target. Caveat emptor.
Simultaneously, they need a light shone on their private lives for the same reason they want to do that to the rest of us: to make sure they're not abusing their access to sensitive information, getting blackmailed, or otherwise being nefarious.
I have absolutely no idea how to fix this apparent paradox. Perhaps it can't be done. Even if it can, tech is unstable and this is all a moving target — the way GenAI is going, I suspect that we'll all have to carry always-on cameras that log and sign everything just to prove we didn't do whatever some picture or video shows us doing.
