I don't think every Killers song sounds like U2, but I get a definite U2 vibe from songs like Somebody Told Me, On Top, and Midnight Show. especially the guitar.
I absolutely agree that the style of Somebody Told Me is a bit U2ish...Well, Brandon Flowers the singer of The Killers - and mainly he writes their songs- is known as a great U2-fanatic! Maybe this is the reason for the little similarity...
Radiohead was playing in a festival here in Switzerland on the 15th August, of course I went.... but many newspapers said they were the only band (with Stones) that was as good as U2 musically.
After seeing them.... I can say that they are miles away from being as good.... very far....