Order and good living conditions is the norm in most of the country. Unless the politicians come specifically from these areas they will be accustomed to that version of Sweden regardless of where they lived most of their life. Even said areas are mostly calm except when the youths are on school breaks.
Plus, the areas you speak of vote for the left (S and V, not MP), aka the very politicians who supposedly don't understand those areas.
Tensta: http://www.val.se/val/val2014/slutresultat/R/valdistrikt/01/...
Rinkeby: http://www.val.se/val/val2014/prelresultat/R/valdistrikt/01/...
Husby: http://www.val.se/val/val2014/prelresultat/L/valdistrikt/01/...
Vivalla: http://www.val.se/val/val2014/slutresultat/K/valdistrikt/18/...