The event that inspired the picture is the war UK and USA are fighting for oil and how soldiers suffer the consequences. There is a soldier who lost two legs sitting on two oil wells, wearing two uniforms (US and UK) and the respective flags on the back with a sign on top that says "Crude" written in petroleum.
The artist used symbolism (flags, oil wells), exaggeration (no legs), and labeling ("Crude reality").
this image makes you infer that if you go to that war you will die or lose your limbs, they are fighting for a material called petroleum, and two countries are fighting together.
They are telling us that their war for crude oil is stupid and people who fight for it are suffering, so we should stop supporting it.
Oil refinery workers and the government would disagree with the picture because they get money from the fight. Soldiers and usually their families will agree with the picture because they're aware of what's happening.
The artist is against the war, he symbolizes it on the picture by showing us the message on every part of it.
This picture is very persuasive. He uses different colours and a mix of cruelty (his legs) and reality (flags).