No, it is unlikely that John Keats would use the word "smear" in this context. The word "smear" implies a deliberate and malicious attack on someone's reputation or character, whereas the context of this poem seems to suggest that the word "smear" is being used more broadly to refer to any negative or critical comments.

John Keats was a Romantic poet who lived in the late 18th and early 19th century, and his poetry tends to focus on themes of beauty, nature, and human emotion. He often used vivid imagery and sensory language to create a powerful emotional impact on his readers. While he did write about social and political issues, his approach was usually more subtle and allusive than the direct and straightforward language used in the word "smear."

How about these changes?

Amidst the strife and woeful pain
That grips the world today,
We hear the cries of those in vain
And see the harsh display.

Yet through the tears and dark of night
There shines a steadfast light,
The human heart's enduring might,
That battles with its might.

For every act of hate and fear,
There is a kindling spark
Of love and hope that draweth near
To heal the wounded heart.

Though sorrow's veil may cloud our view
And troubles may increase,
We find within our hearts anew
A love that will not cease.
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