There is a lot of morbidity and even mortality from untreated psychiatric conditions. So may not have actively killed people but improper treatment can definitely lead to very bad outcomes

Self sufficiency is not really achievable in an urban setting. Hydroponics can definitely increase the yield per square foot but it uses a lot of electricity if done indoors. Also things like cereal grains that require a ton of space can’t really be grown in a hydroponic system.

Hydroponics is good for growing herbs and with grow lights can grow microtomatoes and leafy greens but there’s a lot of limitations to it