@Holiday20310401,
You may have an individual who has a capacity for learning love.
And if that individual practised that love, with Big Brother as the object, then they would probably increase their chances of survival.
Their offspring might inherit their capacity for learning, but may not necesarily direct it towards the same source.
In the book Winston is traumatised into loving Big Brother - but his love, though learned, is really nothing to do with his genetics. It is just that the torturers in the Ministry of Love understand human nature and limitations well enough to manipulate him in this way. He would probaly not make a good parent as he apparently had a natural prediliction for subversive behaviour.
So I doubt practising love would cause your offspring to be loving any more than practising guitar makes your offspring good guitarists. Of course you may have traits that help you learn the guitar that you might also pass to your offspring ... but that would be accidental.
I think other than that we agree. Humans may be homeostatic - but humanity is not, and a totalitarian regime may well exert evolutionary pressures, given enough time, as a more natural change in the environment might. I think it would take many millennia - as humans are good at disguising their natures and adapting - but I generally agree with the idea.