Did Lenin hate the tsarist regime? Maybe he hated it intellectually (because it stood in the way of him seizing power), but he did not hate it emotionally, as far as I know.
In any case: let me rephrase. Keep hate to whatever extent is beneficial and not harmful to yourself.
I disagree. Purging the elites and journo apparatchiks will definitely help.
That is not at all contradictory with 'not bearing a grudge'.
It means not to let it consume you rather than them, as that does them no harm at all.
But hatred helps you purge.
Did Lenin hate the tsarist regime? Maybe he hated it intellectually (because it stood in the way of him seizing power), but he did not hate it emotionally, as far as I know.
In any case: let me rephrase. Keep hate to whatever extent is beneficial and not harmful to yourself.