Some forms of incest are fine and it’s most cultural taboo that makes it a problem. Other types are extremely problematic and should be illegal no questions asked.

The problem then becomes how do you unknot the cultural problems from the legal ones and have anyone willing to actually talk about this in the first place.

Also you have to start getting into the weeds of how distant of a relative before its not incest anymore. Which from my limited knowledge countries seem to disagree on.