All human action is necessarily rational. Yes or No

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With your definition, I'd be tempted to say yes. Mostly because if you view action as goal oriented, and goals as end desires in themselves or paths towards terminal ends, then any action leading towards that end would per your definition be rational.
However, as I've said in discussions before, defining a term in a generally not accepted or simplified way creates problems in terms of the validity of the argument. Let's say you have a person with schizophrenia, who believes that by not eating he'll become stronger, then his actions are rational in accordance with your definition, but not in terms of what can be established as objective fact.

Of course, I'm not exactly sure what you're trying to argue, that rational action is separated from reality, by your definition, it would be possible to argue that if one desires 72 virgins, then it would be perfectly rational to become a martyr for instance.

I've never understood the gamblers mentality, especially when the odds are heavily stacked against them and the losses are potentially huge. I'm not sure how rational an act that is, although the desire is for "satisfaction", knowing the probability of reaching it being low, it's hard to see it as being so. That also applies to any situation where the outcome is unknown, or a limited amount of data is available. I think many people lead their lives in this manner, accepting that an element of "risk" is involved in many decisions in life. I don't feel that taking an action where the probability of success is low or the outcome is largely unknown is particularly rational. I think to be truly rational is to work with as much information as you can get, to know exactly what it is you're actually doing, with a high probability of predicting the outcome. It seems to me that many people aren't actually intersted in gathering all the information they can, or wilfully ignore it. People can be deliberately irrational sometimes. I think you could only say people are always rational if they actually believe what they are doing is going to benefit them. Taking risks is moving away from the sphere of rationality into a whole new dimension of hope, luck etc.