Mack Doggs comments

Police are not afraid of Yakuza, but somehow it's a very complicated issue there in Japan, they are essentially allowed to exist in a certain capacity. I'm still learning about why, but I think it has to do with their traditional honor code and ancient clan roots. Some Yakuza families are worse than others.

In the USA the government and/or corporations would often hire or blackmail the mob to do dirty work for them that they didn't want to be connected to. The Mob was allowed to exist and run rackets in exchange for these "favors" where they would intimidate unions, assassinate political enemies, or harass business competitors.

I believe that yakuza crime is probably reported to a special agency and normal cops don't do much about it, or are even told to allow it to occur because the high ups in the government probably have similar deals going on.