So the answer to your question has long been described in trader psychology.
Conventionally, the process of experiencing losses by a trader can be divided into four stages.
So, what you are talking about, namely the search of excuses for their failures, refers to the first period, let's call it "Denial".
At this stage the trader sort of softens the psychological impact of the obtained loss. He begins to convince himself and others that this is not his fault. The deal was closed with a loss for reasons beyond his control. The trader will never admit that he/she made a mistake when opening the trade order. This stage in itself is not dangerous, as it does not stop the trader and he continues to trade. After passing the denial stage, the trader changes his approach to losses. He already begins to look for the causes of a losing trade in his trading system.