Participation in society involves both rights and obligations.
The expectation the state will ultimately ensure a roof over your head brings with it the obligation to take reasonable care over that which is provided.
Those who knowingly and deliberately damage that which the state/society has entrusted to them are failing to meet their obligations. There needs to be tolerance for those undergoing particular stresses - mental illness, family breakdown etc - but such tolerance should not be unlimited.
Ultimately, if individuals fail in their obligations, society should withdraw support. Some will end up on the streets, non-UK nationals deported etc. Tough - yes, but the safety net exists to protect the vulnerable. It should not tolerate abuse, exploitation and feed an entitlement culture.