Rik,
Society has a right to defend itself.  The means are not always 100% perfect.  I'll just let the Bible speak on this matter....
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".Let everyone be subject to the governing authorities, for there is no authority except that which God has established. The authorities that exist have been established by God. 2 Consequently, whoever rebels against the authority is rebelling against what God has instituted, and those who do so will bring judgment on themselves."  Romans 13:1-2