Because it reacts well to distortion and it sounds better. These are power chords (root note and fifth). If you played a normal chord with intervals (like a major or minor chord) and you play it with distortion, the number of different frequencies generated, and the complex ratios between them, causes the output to sound like crap.
Because most electric and acoustic guitars are tuned based on equal temperament, the minor thirds and major thirds shift (narrower and wider respectively) and it really sounds messy. But with a power chord, the ratio between the frequencies of the root and fifth are very close to the 3:2 interval. When played through distortion, the partials are really close in frequency to the harmonics of the original two notes, producing a wickedly good sound.
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