Great post. And to be fair even at the time some/a lot (I'm not sure of the numbers) of progressive people weren't convinced that airing bigoted views, even in a satirical way, was the right way to go about combatting them. Yes in the course of an episode Garnett would eventually be shown up to be a narrow-minded bigot often defeated by his own idiocy, but taken out of context (which they often were) his speeches about "bleedin' coons" did resonate with a depressingly-large number of white people.Lenny Henry has actually spoken about the unintended consequences of Johnny Speight's good intentions:
"Even Till Death Us Do Part. Johnny Speight created the racist, right wing, monster Alf Garnett, brilliantly portrayed by Warren Mitchell. You might say that Speight was being brutally honest about how racist white people spoke about ethnic minorities, but it didn’t stop Alf being adopted as a hero by the very people he was satirizing.
Speight tried to ensure that in each story line, Alf came off the worst. But when I went to school the next morning, it was always me who came off worst."
Now racists don't need TV, or these days social media to be racist, but the mediums do ease the exchange of terminology and provide convenient and easily communicated pegs for racism to be hung on.
Johnny Speight's voice was Rita and Mike's voice. He was displaying the stupidity of divisive right wing politics being espoused by the working classes, but the character he and Warren Mitchell created became too big and too dominant. People forget that Dandy Nicholls' Else often had the best lines, because Alf had the most lines. A lot of his lines were written to show the failure of his internal logic and the satire was great if you recognised it as satire. However, he became the sitcom monster: The character who took over the show, became an archetype and found a life outside of the sitcom world. The character became too big for Speight, or the even more left wing, Mitchell to control and, in losing context, he ended up losing meaning.
I wouldn't argue that the OP is going out on a limb by suggesting that the show was funny. It was, and is, very funny and its intent was always anti-racist. However, it's methods are perhaps to subtle for these times. I remember an alternative comedian, (probably Stewart Lee, it usually is) saying that the irony used in nineties comedy to deal with race, sexuality etc. was possible because we all thought, perhaps a bit smugly, that everbody had agreed that discrimination was wrong. We've found out since that this hadn't been agreed, just that those who didn't agree had gone quiet for a bit. Now that they are far from quiet, playing with offence in a knowing way becomes easily stripped of all context and can be grist to their mill. Alf's rants were meant to be so stupid and so extreme that you laughed at their ridiculousness and self harm. Unfortunately, the satire has been overtaken by the idiocy of the world and showing it to mass audiences today may leave a few wondering why he was laughed at and not elected.
My mum, who was/is a progressive feminist would always turn the TV off/over when TDUDP came on.