These subjects were redeemed by his steady effort to show that underneath these evil developments of human nature lay immortal good; and that a wise tolerance, based on this underlying godlikeness in man, was the true attitude of the soul towards the false and the stupid in mankind.

This had been his attitude from the beginning.

It differentiates him from Tennyson, who did not maintain that view; and at that point he is a nobler poet than Tennyson.
But he became too much absorbed in the intellectual treatment of these side-issues in human nature.

And I think that he was left unprotected from this or not held back from it by his having almost given up Nature in her relation to man as a subject for his poetry.

To love that great, solemn and beautiful Creature, who even when she seems most merciless retains her glory and loveliness, keeps us from thinking too much on the lower problems of humanity, on its ignobler movements; holds before us infinite grandeur, infinite beauty, infinite order, and suggests and confirms within us eternal aspiration.