Why do some politicans and countries favor gun control

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Is it because they are afraid a little child will find a loaded gun and kill his brother or sister? Is it because they are afraid that a disturbed person may turn the gun on himself and commit suicide? Is it because they are afraid that the robber with intent to harm deserves a fighting chance and a home owner with a gun would shoot back? Are they afraid that the home owner might shoot someone innocent by mistake? I mean the criminals can find guns and weapons, and yet the one defending his home is left at the mercy of the thugs and the police might not get there in time. So why is a homeowner in an isolated location left at the mercy of home invaders with no means to defend himself?