Looking in from the outside it appears that Bernie was the only hope of bringing some sanity into US politics and foreign policy. Hillery is all for war and will likely start another if she makes it to the white house, she has been shown to lie when it suits her so therefore cant be trusted to formulate any policies she puts forward and even if she tried she still has to get them past congress.
But there is still hope for President Sanders, there is I read a criminal investigation going on into the Email thing and it will only take one more scandal and Hillery could be out.
And you want Bernie killed off. Well I suppose the US has killed most of its good presidents and given the bad ones a second term and there are plenty of guns around to do the job so no need for a knife.