I'm having trouble understanding the meaning of 誰だって within different contexts;
誰だって楽な生活をしたい。 Everybody wants to live in comfort.
誰だって 自尊心を 傷つけられるのは 嫌だ。 Nobody wants his sense of worth to be damaged.
As such within these sentences 誰だって means either no one or anyone. What is changing the meaning in the sentence?