Nowadays I consider BTC as a pure speculating coin. Because the volatility turns this cripto not suited for being used on daily needs. I think, as investors, we don't have to defend things that our emotions want, but take best decisions on every scenario. All in all, Keep buying it.
High tx fees is the problem and not volatility. Merchants that accept BTC can use payment processors to exchange their coins to any currency of their choice or they can take payments received in BTC as assets they would store for a long time. High tx fees is what hinders people from spending BTC, because if fees is always high, it becomes difficult for people to spend BTC, especially for payments of small amounts.