system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] As King of Wakanda and the current Black Panther, why was King T'Chaka not wearing some kind of vibranium-armoured clothing or personal shield at the time of the UN bombings in Vienna?

I get that Wakanda was still unrevealed to the world at large, but surely the protection of the leader of the nation comes first?
gpt
For one, T'Chaka wasn't the Black Panther at the time of the bombing, he had passed that mantle to T'challa by that point.  
Beyond that, it was a risk calculation.  The risk of the meeting in Vienna being bombed was very low, and the risk of vibranium armor being discovered is rather high.  
And on the other side of the coin, the death of the King is tragic, but Wakanda goes on.  Discovery of the truth of Wakanda's power and position has lasting implications for the whole nation.