Why did Britain perceive Vernet's actions as a threat?

Britain perceived Vernet's actions as a threat primarily because he could potentially target British merchants next. Vernet's involvement in the South Atlantic, particularly concerning controlling the Falkland Islands and asserting Argentine sovereignty, raised alarms for British trade interests in the region. The British were wary of any challenges to their commercial routes, and if Vernet was successful in expanding Argentine control or advocating for independence, it could disrupt their shipping lanes and financial interests.

The recognition of Vernet as a risk was not solely about his immediate actions but rather the broader implications of those actions against British commerce. This apprehension related to the declining influence of Britain in that part of the world, especially if Argentina consolidated its position under Vernet's leadership and resisted British claims. Therefore, the potential for Vernet to target British merchants formed a significant part of why he was viewed as a threat.