Seriously. It's a known issue, almost a cliche, and has been for a while. If somebody had some suggestions, they'd get to the point quickly. Let me re-write it with some (bad) ideas:

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Humans evolved with sticks and stones, and their resulting evolved sense of morality cannot be trusted with guns and bombs and nuclear weapons, etc. Therefore I propose the following.

First, as stopgap measures:

1. Putting female hormones in the world's water supply.

2. Decommissioning all nuclear power plants and all machinery capable of refining uranium.

3. Placing every military under the direct control of the United Nations.

Second, as an eventual permanent solution:

1. Neutering all violent criminals on their first offense, as well as all past violent offenders. Neutering all other criminals who have been identified as having antisocial personality disorder. Since this will be required in all countries, the authority to do this will be placed with the United Nations.

2. An unlimited budget will be allotted for the purpose of researching and enacting a method for mining the entire planet's reserve of uranium and rendering it inoperable or unobtainable.