I think "charge" here refers to an emotional charge, that is, a denialist is unlikely to constructively engage in a conversation/debate because he or she is usually overly emotional about an issue and can't approach it in a rational way (this will surely hinder communication).
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NL888Thanks.I think "The charge of 'denialist' " here means "The charge against 'denialist' ." Am I on the right track?No. To paraphrase: "When one party in a discussion accuses the other of being a denialist ...." To make a charge can mean to run aggressively, but it can also mean, as it does here, to accuse; they charge him with a figurative crime the way a
NL888So " "The charge of 'denialist' " means "the accusation on 'denialish'"?the accusation by one party that that the other party is a denialist