推荐回答（5个）
古代学者大多都看过<<周易>>因该懂些星像问题.当时诸葛亮夜观天像知道荆州要陨一大将.而他为什么不去救呢?因为关羽(水淹七军)抢了他在世人面前的风头.关羽一死他在刘备军中就更大.这样他可以大展拳脚...以威名卧龙的名号...当初刘备问他谁可守荆州.当时是诸葛亮说的关羽可以担当..也就是这样一来他可以在蜀地和汉中立功.谁都知道关羽在刘备手下那是非同小可.脾气也不好怎么能派他去呢?易中天说他忠心.难道赵云不忠心吗?黄忠不忠心吗?派个脾气不好的人去.行吗?不行..就像易中天说的荆州没打黎芳.傅世仁就降了......所以诸葛亮这个说话其实是个阴谋..不一定易中天说的都是对的.也不一定我也是对的.只是说出来大家看看.其实我也不知道诸葛亮到底怎么想的.其实我很崇拜诸葛亮..但是就这件事我想不通???
诸葛亮留关羽守荆州，是出于私心！
关羽在三国演义中是个相当重要和特殊的角色。刘备对其可称得上是绝对信任！
诸葛亮清楚地知道刘备相信关羽胜于相信自己（这对自己在国家的权威有不小的竞争力），更知道关羽此人甚是孤傲，荆州定会失守。而一旦荆州失守，关羽回国便会有所忌惮，与华容道义释曹操是一样的道理（可说是诸葛亮为压服关羽而为其设计的又一个小辫子）。诸葛亮甚至想到关羽会因此送命，不过，后来刘备举一国之兵为关羽雪耻！为其治国平天下凭添了不少的阻力，却是他万万没有料到的！
诸葛亮用人之关羽失荆州的三大原因 一失：不恤小人，痛责糜芳士仁等鼠贼，致使鼠贼有借口背信投降，让后世诬关之辈拿到口实．该当对小人们和颜悦色，既往不咎，让彼等继续开门揖盗才是． 二失：好高务远，居然以半州之地，北击曹操，破曹仁，杀庞德，围樊城，败于禁，拒徐晃，惊曹瞒．致使荆州空虚。该当畏敌如虎，缩头仿龟，伏低做小，寸步不进才是． 三失：未和东吴：江东孙家，匿玉玺，叛联军，借兵于袁术而围寿春，许婚于曹操而烧赤壁，几番反复，对这等无信无义的匪类，应当继续加以信任，”东和孙权”，持续让步，腆颜相告以饱其欲才是．居然还堆起烽火台来防贼，实在是太不友好了。
里头诸葛亮搞的鬼，目的就是造成他以后的大权独揽，排除二哥的二把手地位 。。。
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