If we disregard the geopolitics and foreign interventions, cold war UK, France or USA was a decent regime to its own people.

If we disregard the geopolitics and foreign interventions, cold war USSR was a horrible regime against its own people.

There are all kinds of horrible things done by those regimes to their own people as well, but they aren't comparable in scale.

It's terrible no matter who does it. You tried to claim that it was less terrible for the USSR to do it, because other countries did it too.

Worse than no justice is only selective justice: one set of rules for us vs. another set of rules for them

True, but no justice is still pretty bad, and you're advocating for it vigorously.