It isn't. BB is not directly taking on the Holy land, that goes against how he handles fights. He instigates a big fight between two superpowers and then jumps his target.

Besides he literally wants to join the WG
I wonder if BB wanted to join purely because Shiryu and Lafita are dumb and told him bad information about the man marked by flames and thought by joining the WG he’d find out who had the poneglyph
 
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