Russia is already fighting all of NATO in some areas, Ukraine already uses NATO training and aerial reconnaissance/space reconnaissance resources, British troops on the ground perform some of the steps (Ukrainians performing the others) to fire missiles
"we have to defeat the undemocratic enemy who murders their internal political opponents, and its important we kill evil traitors within our own nation to do this"
Well I don't think that's a given and I also don't think that if that was the case it'd then follow that this policy is silly but I see and agree with the general points you're making
I don't really see how it's pointless? The average person probably underestimated the risk of the UK being dragged into a conflict in this decade or the next and thus also the risk they'd need to prepare for that, so it's probably helpful to bring how much people think they need to prep in line with how much they should prep, could save some lives.
Don't use plungers, just use a heap of oxygen bleach and possibly also soap (and time)