It's well documented that the Labour Party is more than sympathetic to many terrorist causes around the world. It's no surprise then that whenever the issue of Daesh returnees raises its head, senior party figures immediately spring to the defence of the Islamists. As far as Labour are concerned, the human rights of killers, rapists, torturers and terrorists trumps the rights of law abiding British citizens to live in a safe environment.
Shamima Begum made her bed and she is unrepentant about it. If she wishes to continue living in an Islamic society, free of the vile kuffar way of life that she despises - let her go forth to Bangladesh or rot in the desert. Either way, most British people are fine with that.