Karma, in its mainstream bastardized form, is a silly idea that a lot of people don't understand. It isn't a magical force that rewards good deeds and punishes wickedness. It is also, to use a tired phrase, not the take-a-penny-leave-a-penny. The results and consequences of your actions can be derived through the use of simple logic. If you do good things for people they are more likely to help you out, and if you commit grievances against others they're more likely to return that "favor".
The idea that my actions against Agent D. would have any affect on my real life is absurd. I only know of him through the internet; so little I do could(should) affect his real life. Harsh comments over the internet should be taken with a grain of salt, people tend to act differently or with more fervor with a state of anonymity. Unless you are interacting with people you have connections with in real life, the Karma generated is separate. The only things that can happen to me are virtual; I may get yelled at, made fun of, or if the party I offended is extremely sophomoric I may receive spam in its various incarnations. In this situation with Agent D. he could find out where I live or execute something similar and harass me(because of harsh language over the internet), but frankly, that would make him more pathetic than you are making me out to be.
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The argument that people are abusive over the internet solely because they use it as an escapist medium to project their troubles onto others is foolish to conceive when you know little of the person you're accusing. I have no similar problems to Agent D., or any at all in fact. That's not to say I never have or never will. The biggest issue concerning me right now is the start of college, the workload it brings, and self-confidence issues, socially and intellectually. And typing out my counter-points to your weak arguments has given me a euphoric release of stress and relieved my self-confidence issues. I'm trying to create a healthy social exchange using thought out and clairvoyant language.
To bring us back to my main argument I'm not projecting my problems to Agent D. What angered me was Agent D.'s inability to comprehend that Nicole knew nothing of his mother's condition, yet went into a fit of rage over comments she made that had no intention of harm. I doubt her comments would have enraged him if his mother was not in her current state of health. I'm not saying he would agree with her or companion her comments otherwise, he said he doesn't normally do that. It is foolish though to have a change of mind so violently based on the sole reason that the undesirable condition has affected him. An article in agreement with mine can be found here. Although it does not deal with this exact situation, it is very similar and can better help you understand my views.
Agent D. is letting his emotions get the best of him, this can be dangerous to him both online and in real life. If he truly wished for no one to know his mother's illness he could have easily ignored Nicole or if he trusted her enough, confide to her in a private chat and politely ask her to refrain from similar comments. I'm sure she would have complied with that request.
I welcome a counter argument and hope to respond to it, but I may be strained on time as I have actual school work to complete. Please refrain from any further ad hominem arguments, as I had the courtesy to do so.