Traders react to what they think is going to happen, not what is currently happening. Also they usually do not trade as emotionally, but rather based on processed information.
It becomes clear that this war is going to last and oil supplies will be further delayed, lowering economical prospects worldwide, which causes the market to react. A volatile market also creates some opportunities for profit as traders can gain both when the market value increases and decreases, depending on how they are trading (although it also increases risk). If you are skeptical, market manipulation is also a possibility as Trump administration is already being investigated for this.