They are cowards. They will continue to attack simple minded liberal havens in first world countries with little to no resistence, because they know they will encounter little to no resistence. They will become emboldened with the acts they commit against the weak, until the violence they bring upon others is met and repelled with better violence. You can't reason with people who aren't willing to reason. If all they know is terror, instill terror in them. If those they surround themselves with and hide among are unwilling to refuse them quarter or remain complicit in their acts, they should suffer in the retaliation and have their complaints fall on deaf ears. Don't want to be collateral damage, don't be where damage will come when its looking for these cowards.