The Question and Answer section for Wordsworth’s Poetical Works is a great resource to ask questions, find answers, and discuss the novel.
I think Wordsworth is lamenting how man continues to hurt himself. He continues to destroy his brother and exploit nature: man will be his own undoing.
The speaker's attitude seems tranquil and gentle.
Wordsworth was an amazing poet. He was a key figure of Romanticism. His poetry merged the wonder of nature, God, and the universe.