Even though the Kindle lacks a good hyphenation engine, they still justify the text, without giving you the option to left align it. Fully justified text only works when it’s done right, when words are properly hyphenated and when the spaces between letters and words are tweaked ever so slightly to compensate for any space inequalities that still remain. It’s one of the reasons why professionals use expensive software like InDesign to typeset books, and not something standard like Word.
I don’t get it. There obviously is a hidden option to deactivate the fully justified text, but apparently nobody cared to build a button for it. It’s not like the rag looks worse, or something.