They're the ones who don't accept that they're wrong even when large-scale, highly soundly methodologically designed research and analysis demonstrate that they are.
You know, the ones who say "My neighbour has wi-fi, and I get headaches, therefore the two things are causally related". The same ones who force me into suffering crap phone reception because they won't let anyone build a new mast within half a mile of a local school. The ones who endanger the health of my friends kids by not getting theirs vaccinated.
Now, go RTFA. "...but rather that it simply proved that no cell-phone causation could be discovered in their study of 59,984 brain tumor sufferers... the increased risk in this population is too small to be observed, the increased risk is restricted to subgroups of brain tumors or mobile phone users, or there is no increased risk.
"Our finding that brain tumor incidence rates were either stable, decreased, or continued a gradual increase that started before the introduction of mobile phones, is consistent with mobile phone use having no observable effect on brain tumor incidence."
60 000 a big enough sample for you?