So, posting links to peer-reviewed, published scientific research that just about unanimously conclude that bike helmets help prevent injury causes a few cranks to resort to personal attacks because they refuse to address the ONE simple question of whether or not bike helmets help prevent injury.

Then, when those cranks get a thread closed down, those cranks say it's MY fault that THEIR name-calling caused "[t]he nature of its (sic) discourse" to "degenerate". So those very same cranks complain.

Then they bring their complaints and personal attacks over here.

Because the cranks simply can't understand that throw-away remarks about how "helmets MAY help prevent injury" in research that is NOT directed at bicycle helmets and their effect in injuries in no way refutes twenty or so studies that DIRECTLY address that ONE question. The cranks refuse to understand that to refute THAT body of evidence, they MUST produce multiple studies DIRECTLY addressing that ONE question - Are bike helmets effective in preventing injury? - that shows NO EFFECT.

And guess what? There's NO SUCH RESEARCH.

Throw away statements in studies titled "Heat transfer variations of bicycle helmets" in no way can create a "controversy" regarding the conclusions of an entire body of research ON A DIFFERENT SUBJECT. Also, the cranks also fail to understand that conclusions such as "Bicycle helmets may reduce the severity of accident consequences by preventing or reducing the severity of head, brain, and face injuries." in a study about "Preventing pedestrian accidents and making them less severe" is NOT evidence that there's a controversy in the research regarding the efficacy of bike helmets in preventing injury.

Just about every bit of research done that directly addresses bike helmets and their effect on injuries show significant effect in preventing head injuries. And for every outlier study that shows little to no effect, there's another outlier that shows a preposterously huge effect.

So, no. Don't go believing that there's a "controversy" about the efficacy of bike helmets in preventing injury. Every bit of research on THAT question supports the conclusion that bike helmets do have a significant effect in preventing head injuries. Don't buy into the manufactured "controversy" that has to rely on statements from research on pedestrians and helmet ventilation to try to CREATE the impression that there even is a controversy.

There isn't.

And you can read the discussion page for the Wikipedia page on bike helmets for some more insight into how a few cranks have tried to manufacture this "controversy".

PS - "it is" contracts to "it's", "its" is possesive. You're a professional writer?