False positive in wiki editing is much, much worse than false negative. Just as with spam - if your spam filter deletes one email from your CEO, it is much worse than letting in 20 spam emails. Here, also, letting one uninformed, but active Wikipedia bureaucrat to prevail over a more informed scientist is much worse than letting 10 crappy articles to stay on the site and quietly rot while nobody visits them. The latter just wastes tiny bit of resources, the former actually has high potential to spread false information. And given lazy journalists frequently limit their research to looking up stuff in wikipedia, soon the falsity becomes "common knowledge" and then becomes its own source as publications quote Wikipedia which quotes publications.