Because good-looking people have perfect lives and unfaultable existence!
Research has shown that we (everyday folks) automatically assign favourable traits such as talent, kindness, honesty, and intelligence to good-looking individuals (see Langlois et al., 2000). The irony is that “good-looking people” are aware that other people’s positive evaluations of them are not based on their actual traits and abilities are caused by a general attractiveness or “halo” ― Robert B. Cialdini, Influence