Originally Posted by foxtrapper
That's actually not in the OP's post. He was very careful to avoid exactly that.
You are absolutely correct that those words where not in the OP as he was painfully careful to not call Harley riders stupid for not choosing to ride ATGATT, but that is exactly the predicate of his question which is why so many Harley riders get defensive when asked to "explain", as a proxy for "justify", why many Harley riders make the personal choice to ride without protective equipment.
Risk evaluation is relative and the vast majority of people judge the wisdom of the decisions others make based on their own personal evaluation of the levels of risk they find acceptable. Those who choose to engage in dangerous behaviors, dangerous by our own subjective judgment, are stupid or foolish while those who criticize our own behaviors as dangerous are just a bunch of scared wimps living lives dictated by their fears. It is hard to step back from our own evaluations of risk to look at the topic objectively. If a behavior is dramatically outside the level of risk we find acceptable, then it might go beyond being just stupid and become characterized as crazy or even admirable; I think BASE jumpers are just nuts and I admire them for their fearlessness. Do you honestly think the OP admires Harley riders for their lack of gear? We make choices for ourselves, others who make the same choice are affirming our decision, and those who make the opposite choice are critical of our decision. It is only natural to look at risk from our own personal and subjective judgment of acceptable levels of risk, but I think it is important to understand the process in order to maintain at least a minimal level of respect for the right each man has to make these same judgments for himself.
When we fail to do so we end up with politicals like Michael Bloomberg, FYYFF, dictating how big a soft-drink we can purchase at a 7-Eleven or a state telling us that we must use a government approved DOT helmet. I would reflect on the reality that the range of personal choices we are "allowed" to make by our governments are continually shrinking and I personally find this chafing and oppressive.
Not only should we consider the answer to the OP's question, we should understand why these questions get asked over and over again. The first response by cybrdyke, "Because they dont want to", is still the best and I just want people to comprehend why this is so.