"A tour of BSD for Linux people" sounds like a genuinely interesting read, but the aggressively defensive tone starting in the second paragraph and continuing t

"A tour of BSD for Linux people" sounds like a genuinely interesting read, but the aggressively defensive tone starting in the second paragraph and continuing throughout the introduction turned me off of reading past the first page. I'm definitely interested in how BSD differs from Linux, but I'm not interested in being lectured at. (So, please tell me if it tones down after the first page.)