The quest to learn why a Florida condo building collapsed has already moved to the legal system, even before rescuers finish searching for victims and possible survivors. Authorities have opened criminal and civil investigations into the collapse of the oceanfront Champlain Towers South, which killed at least 36 people and left more than 100 missing. At least six lawsuits have been filed by Champlain Towers families. “The whole world wants to know what happened here,” Miami-Dade County Mayor Daniella Levine Cava told a news conference Tuesday. Everyone, she said, wants to know “what could have been prevented and how we make sure it never happens again.” Miami-Dade State Attorney Katherine Fernandez Rundle has pledged to bring the matter to a grand jury, which will gather evidence and hear testimony, and could recommend criminal charges or needed reforms. One lawyer involved in the litigation said the collapse raises widespread concerns about …