This man:
www.dailymail.co.uk/news/article-2246973/Slum-landlord-David-McCabe-left-tenants-Dickensian-squalor-faces-letting-ban-Britains-property-rental-ASBO.html
has been a landlord of 30 years. He makes his money by renting out squalid, uninhabitable wrecks to men on housing benefit.
He ignored orders to fix the properties, appealed, and the sentences has been confirmed.
www.plymouthherald.co.uk/Rogue-landlord-rented-rooms-squalid-houses-court/story-20789663-detail/story.html
Some of the 'Benefits Streets' houses were owned by similar landlords who did nothing to maintain conditions fit for human habitation but still sponged off state benefits paid to their tenants. There must be hundreds of thousands of these places up and down the country left in this mess.
Landlords generally tend to be greedy and reluctant to do maintenance, but at least those renting out more expensive places have to do them up to get tenants in in the first place.
It is pure greed, tenants in these circumstances don't necessarily keep good care of properties, but that's the choice you as a landlord make when you choose to enter the business - don't like it, sell up.
Prison sentences surely the next step?