Bernie Sanders
In reply to the discussion: BLM/Hillary supporter on twitter just called Sanders "the enemy" . . . [View all]riversedge
(69,537 posts)considered the most progressive by many which may be a factor and I think IMO their expectations are higher than they are for the other candidates. And the blm movement (the activists who interrupted Bernie's speech) say Bernie has not done enough-has not responded to them enough {see their facebook page}.
And there is the factor-as others have pointed out-- that Hillary has secret service agents surrounding her (? how many). Messing with Federal agents --I think--would carry more severe penalties (fines, jail time -whatever)
Another factor is that Sanders plans for larger crowds and can most likely get more media attention (which they do get much to the dismay of many Sanders (and BLM ) supporters.
This is all speculation of course but may factor into why they only interrupt Sanders speeches. In the end we need answers from those who actually do the interruptions (as to why they only target Sanders).