Depends wat you mean by a debate.

Ideally, a debate is an intelligent and constructive exchange of arguments intended to establish a clearer understanding of an isue.

Sometimes though, debating is about making your opponent look like a donkey.

Anyone who insists on holding onto an untenable point of view in the face of overwhelming evidence against it, is asking for a bruising intellectually.

Again, the point isn't to change their minds, but to convince neutral observers that deniers have no leg to stand on and that they and their weak position are laughable and not worthy of the space they occupy.

Invite them onto the radio and assist them to make fools of themselves.

It's all about who's listening.

PS

A revisionist historian is one who argues that the established view of history is wrong and that a different version is right.

Someone who denies the holocaust is doing just that.

The distinction is false.