To be honest, the world has gained the massive ability to communicate without interacting. Sitting in doors talking to people probably defines loneliness the fact people ignore people who may suffer with it is bad.
The elderly? Yeah they suffer from it. [Put them all in homes and they then have friends or educate them on computers of how to interact online safely]
Young people? [Put them in schools and encourage them to be social even if minor groups]
Loneliness is what mostly causes isolation, depression, stress, anti social-ness and tons of other mental problems. To a degree I believe loneliness is the first stage of a mental illness in most situations.
Pet animals normally go to quiet 'out of the way' places to die...
People who are lonely, well...
With no social life they are unable to interact with society and have effectively died because of the requirement of communication.
Loneliness should be targeted as the precursor of other more serious mental illnesses. This knowledge and prevention could help people before they get to the stage we can't turn them back from.