a) The debate is happening whether Bill Nye takes part or not.
b) If proponents of proposition A are unwilling to debate proponents of proposition B then proponents of A will be look like they don't believe in their proposition. You need to be willing to defend your beliefs.
c) Debating someone does not legitimize their proposition. I believe you are legitimizing their proposition if you refuse to debate them.
b) If proponents of proposition A are unwilling to debate proponents of proposition B then proponents of A will be look like they don't believe in their proposition. You need to be willing to defend your beliefs.
c) Debating someone does not legitimize their proposition. I believe you are legitimizing their proposition if you refuse to debate them.