It certainly can be solved. The real think is people in power don't want to solve it, and the voters don't want to invest in solving it. Admitting your own folly and vainness is much more difficult than dismissing it as an "impossible problem".
>Some people are simply selfish and will not be able to live close to/with others without causing problems. _Most_ people do not want to live next to them.
And those people do not get the help they need. Again, and investment no one cares to put in. Better to sweep it under the rug and try to rely on the security of higher income areas to deal with it than taking preventative measures.