1. almost all mutations are bad
2. mutations come together (like if you’re born near chernobyl you’ll have a ton of mutations all over the place, also maybe if your parents are older or if they’re smokers and things like that)
Mutations that make you less attractive could be completely different from mutations that make you less intelligent, but if mutations tend to come in packs then having a lot of mutations in sections of the genome related to attractiveness probably means you have lots of mutations in the sections related to intelligence.