If this is not a problem, I would recommend discussion about Bitcoin regarding its technology (perhaps something with scalability).
Scalability isn't easy topic and heated discussion/ideology clash will happen because there are many different perspective. Something easier such as multi-signature and seed/mnemonic would be better.
Heated discussion? Conflicting perspectives? Perfect! Isn't that the purpose of
discussion? I don't see a problem with showing others different reasons when it comes to something this important in the crypto-space.
By divulging ideas to one another, we in turn change the way we think. There shouldn't be a fear of politick.