Irony of the Government
The government is every bit a threat to the citizens of Earth as the Trisolarans are as they are willing to make use of draconian methods to get people to do what they want, regardless of what they feel about participating, such as in Luo Ji’s case. In many ways the government is an even more fearsome threat than the Trisolarans as they have just as many agents watching the character's every move and they, unlike the aliens humanity fears, do not have to travel several million lightyears to cause them trouble.
Irony of Luo Ji
Luo Ji is a reluctant hero who refuses to be a Wallfacer. His reasons are never clearly explained in the novel. Regardless of his reasons for not wanting to participate as a Wallfacer one fact is clear: the continued existence of life on Earth, as well as the lives of people he cares about, are in mortal danger and all are contingent on his involvement in the program.
Irony of the Trisolarans
The Trisolarans, despite their immense technological advancement, are completely incapable of internal monologue. This unique quirk of alien psychology becomes a turning point in Earth’s war efforts against them, as it quickly becomes evident that the human mind is truly the only place that the Trisolarans cannot go to.
Irony of Peace
The peace that is eventually achieved between Earth and the Trisolarans is at best a farce. The peace that both societies later enjoy first comes at the threat of mutually assured annihilation--a planetary, cross-cultural, interspecies standoff.
