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<p>It is quite understandable that people’s thirst for revenge gets stronger when they get “hot” after being attacked (whether actually, or in perception, and not necessarily physically). That is why riots can be easy to incite in some situations, and why long running conflicts (e.g. Israelis and Palestinians, or more mundane situations like divorced ex-spouses suing each other over what others consider trivial matters) go on despite it being in almost everyone’s self-interest to make peace and move on. But thirst for revenge often results in people costing or risking themselves in order to harm others.</p>
<p>Of course, that thirst for revenge is understandable does not mean that acts of revenge are necessarily legal or desirable.</p>
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<p>However, in terms of the possibility that he may be in legal jeopardy, the law as it exists, where it draws the line on self defense, and whether he crossed it, is what matters, not what the medical understanding of his state is.</p>