I think the statement "secure people..." is a really broad generalization that misses the point being made here. It does not take much to make someone insecure. There are thousands of examples: food, money, romance, work, housing, etc. Every person effected by one or more of these is a Mr. C. They simply just need the right catalyst to fully realize it.
One may wonder if society in general wasn't so cruel to certain people would Mr. C even exist. To quote the article:
> He is the product of a democracy hypocritically preaching social equality and practicing a carelessly brutal snobbery. He is a sensitive, gifted man who has been humiliated into nihilism. He would laugh to see heads roll.