Khandro - //ISIS isn't a definable group it is an ideology, the objectives of that ideology are the same now as has existed for over a millennia, viz, the total eradication of Jews, Christians and everyone (including even other Muslims who happen not to be Sunni) , and the formation of a world-order based their mediaeval beliefs and lies.
You cannot negotiate with jihadism any more than you can negotiate with any other concept; Communism, Capitalism or whatever. //
They would beg to differ - and maybe looking at things from their perspective would be a good start.
If you want to try and reach a solution to a problem, you need to start looking for common ground - humanity in this case.
Starting from a position where you don't recognise the legitimacy of the other side's organisation is not really likely to set them off in a mood to listen to what you are trying to say.