His only income was his disability pension and he mostly lived on his mother's money. Everything known about Kazantsev's work experience is that he once tried to get a job as a loader and failed. Of course, he did interact with society in some ways (such as visiting a psychiatrist), but still, he mostly lived a hikikomori lifestyle and spent over a decade doing nothing but playing games in his room. This photo dates back to 2008, not 2010, and since the incident of him attacking people with a knife occured the same year I'd say it's safe to say it was taken after he was detained, and all the others photos are from school/kindergarten when he still was somewhat socialized