Not because he knew too much, but because the head of the German Army let Hitler know they would not support him unless he disbanded and disavowed association with the SA/Brownshirts. Therefore ‘The Night of the Long Knives’ became part of German history.
Disagree, with multiple sources. Start with The Pink Swastika, and then go on to Gay Berlin. The NAZI Party held its first meetings in a gay bar. Gay blackmail was exceptionally common among, particularly because of existing anti-sodomy law per Paragraph 175. Hirschfeld's Institute provideded "therapy" sessions, and kept meticulous records.