The actual reason for this depiction is shrouded in mystery and likely a result of accumulated errors and evolving artistic styles over centuries. Here's a breakdown of the likely contributing factors:
* Historical Errors and Redesign: Playing card designs have been copied and re-copied for centuries, often by hand. During this process, details can easily be misinterpreted or altered. The axe or war hammer he originally held may have been misinterpreted, or he may have had it replaced with a sword during the French Revolution.
* Symbolism and Artistic Interpretation: Kings, in general, represent power, leadership, and rulership. The King of Hearts, in particular, has sometimes been associated with historical figures like Charlemagne (although this is debated). The sword might have initially been a symbol of his authority or a weapon used in battle, but over time, it became stylized and perhaps unintentionally suggestive of self-inflicted violence.
* Association with Suicide: There is no historical basis for the depiction to have started with suicidal undertones, and is likely a morbid modern interpretation based on misinterpreting a drawing error.
In summary, the "suicide king" depiction is likely a result of historical inaccuracies and artistic interpretations that evolved over time, rather than any intentional design choice.