I think you've been caught up in the narrative that's infecting the dim witted. This murderer wasn't an Islamist terrorist, or infact a Muslim, nor was he an illegal immigrant who came here by boat. By all means use other examples to justify this reaction but you're way off the mark using these 3 poor children's murder for it.
They are all killers that came into the country as a result of an immigration policy out of control.