That's stupid. Maybe people consider Paul a good role model because of his charity work? (and I don't mean just with PETA) or the fact that he raised decent, non-screwed up kids? Didn't marry half a dozen sluts and then cheat on them with other sluts? Or maybe it's the fact that he's a musical genius? I don't agree with his views regarding marijuana, however, you have to take into account that he was the last Beatle to try LSD and used it the least, even though he was more open about it. And he didn't get into any hard drugs like cocaine or heroin, either.
Lastly, he was a pivotal member of the most important band in history.