The Tone of the poem is ironic yet accepting. The dictation of the poem shows us desire and hatred will eventually destroy us. This is ironic because the two most dominant humans emotions will destroy us.
The theme of the poem is the imbalance of emotions could lead to destruction if not contained. this shows that our hate can destroy us while also are desire and greed will cause more hate and cause more destruction. The theme is showing the poem is very depressing but accepting.
The poem revolves around the two symbols of fire and ice. In the first two lines, we don't yet know that they are symbols. Judging by these lines alone, this could be a poem about theories of modern science. But when the speaker associates fire with desire and ice with hate, we know that fire and ice are symbols for human behaviors and emotions but the poem does not close down possibilities for your imagination to run wild by telling us exactly what these two basic forces represent. so feel free to relate them to your own thoughts and experiences and come up with your own interpretation on it.