The only way to bring people together is to talk to them and try to influence their beliefs. You condemn a man who does this because you cannot see the benefit of this approach
OldMeg, I would normally agree with your statement about bringing people together to talk is a way to attempt to find a common ground. However, Corbyn does not do this does he? He give platform and publicity to speakers, leaders and activists who are members of extreme groups who often advocate violent change against those they disagree with, as with Hamas, PLO, PLA etc as far as the Lavant area is concerned, and of course the IRA for over thirty years before it morphed from a violent terrorist group into a Political party and that support continues now.
Your concern that Corbyn is condemned for this, "because we cannot see the benefits of his approach" is correct. There are no benefits to civilised, peaceful, society from his approach. Encouraging, giving air time and a platform to extremists who believe in conflict is not 'trying to influence their beliefs" as you put it in a positive way, it is reinforcing their views by extending their sphere of influence by giving them a high profile public platform from which to spread their ideology.