The East End has always contained some of London's poorest areas. The main reasons for this include: The medieval system of copyhold, which prevailed throughout the Manor of Stepney into the 19th century. There was little point in developing land that was held on short leases.
The number of knife or sharp instrument offences recorded by the police in London rose to approximately 12,786 in 2022/23, compared with 11,122 in the previous year. This was the highest number of knife crime offences reported in London since 2019/20, when there were 15,928.
Kings Cross is perfectly safe, and late at night the station will be busy with people returning from nights out in Central London. Just take the usual precautions that you would in any large city anywhere in the world, and make sure you are familiar with the route from the station to your accommodation.
Yes, very safe if you are sensible. Leave it until 10.30 though as it doesn't get dark until then. Verrrrry safe. Usual caveat about being sensible as usual.