The BBC is not quite fully publicly funded, not quite paid for by a ‘tax’, but is supposed to provide a public service.
As a public service broadcaster, my understanding of what it’s meant to do is that I should benefit (in fact we all should) from YOU using its service, which justifies “public” funding of it.
So if YOUR KIDS watch or listen to or use something educational from the BBC, I should benefit from them being more knowledgable so they are better equipped for the workforce, more able to participate in democracy, more likely to do something useful with their lives.
Similar points carry through to much older audiences too - with really obvious educational stuff like open university, and less direct stuff like natural history programmes for example.
I should also benefit from you having access to genuinely unbiased, high quality journalism - which isn’t owned by individuals who have a huge vested interest in certain messages being promoted or squashed. If you are able to read or hear or watch objective, accurate reporting, instead of distorted, biased news, or a swamp of lies and nonsense online, then I benefit from you making more informed decisions, and taking actions on the basis of real facts.
I suppose some people would maybe put in things like the social cohesion nudged a little positively by all having the chance to share in a moment like an England World Cup final etc.
I’d guess that anything that improves YOUR health is good for me too, as it saves NHS costs, so if you using BBC services helps you develop a healthier lifestyle, then I gain (and you’d also remain fit enough to contribute to society).
I’m sure there’s lots more avenues others could name, some very similar and some really different. But you get the idea - any public service benefits all of us indirectly from others using it. I think this is a pretty weird concept for most of us today, as from Thatcher through Blair and onwards we all just look at everything as customers, seeing only our own immediate consumption of anything as the endpoint.
Whether the BBC right now is doing all of the above is another matter of course! If it’s not doing those things very well though, then that’s not an argument that those things don’t need doing…
That means the BBC should be better, rather than meaning it should be demolished.
I can’t defend Mrs Brown’s Boys, except with the rather pathetic excuse that you can’t do anything as a public service unless people are watching and - unbelievably - a lot of people watch it, so maybe it builds an audience that will engage with other parts of the BBC’s output (yeah, pretty weak I know).