If it Is it true that vengeance is the Lord, why do so many people take matters into their own hands?

Because for many people, god is an excuse to behave badly.

Personally, I feel much safer with a functioning legal system--no matter its limits and failures--than simply praying to or expecting some god to protect me and my family from the local murders, rapists, pedophiles, etc.

As for personal vengeance: That's pretty stupid. Especially if you happen to go after the wrong person. That makes you the perpetrator and, according to your personal ethos, grants that person the right of vengeance against you.

That is just human nature and exactly what that quote was meant to fight.

Try to keep in mind that back then God represented the State of Israel to the Hebrews.

Jehovah,Lord, Yahweh, God represented the state to them in the same way the Crown (Queen) represents England to the English mind or the Constitution represents the USA to American minds.

If you were saying that today you would say, "It is up to the courts to deliver justice." instead of saying God and advise against taking the law into your own hands.

Jesus said that He was the truth, the life and the way, that no man comes to the Father except by Him. Many have ignored Him.

To answer your question, people take matters into their own hands for the same reason; they ignore what God has said in His word.

Because vengeance is the Lord. and sometimes victims don't agree with the authorities

Jehovah God says: “Vengeance is mine, and retribution.” (De 32:35; Ro 12:19; Heb 10:30) Therefore the servant of God does not take vengeance into his own hands; neither does he wish for calamity on his enemies for personal satisfaction, remembering the wise counsel: “When your enemy falls, do not rejoice; and when he is caused to stumble, may your heart not be joyful.” (Pr 24:17)

The Bible’s counsel is: “Return evil for evil to no one.” “Do not avenge yourselves . . . ‘Vengeance is mine; I will repay, says Jehovah.’” “Do not let yourself be conquered by the evil, but keep conquering the evil with the good.” (Ro 12:17, 19, 21)

Because they stupid and think it's the only way/ I'm not christian and I think vengeance is a waste of time. It's a Poison to the mind.

Because they are not following God's command. You can do this, the word says that God will do a better job of it and you should leave room for His wrath. If you do it yourself, you could be wrong and God's will be more just. Also, your job is to forgive, not strike out at someone.

Human nature

For the most part ignorance, and because emotions get in the way sometimes.

Hi Reverend.

I Cr 13:8a

Because we are impatient people and we dont think that God will do it the way we want it done. We want to hurt the person the way we were hurt, and we know that God will deal out the consequences a different way.