Final answer:
According to Thurgood Marshall, affirmative action was necessary to proactively counter patterns of historic discrimination and create a fair and equal playing field for minority candidates.
Step-by-step explanation:
Affirmative action was necessary according to Thurgood Marshall because it was seen as a proactive remedy to counter patterns of historic discrimination. It aimed to address the inequalities faced by minority groups by actively recruiting minority candidates and considering diversity as a positive attribute in employment decisions. Marshall believed that simply ending overt discriminatory policies would not be enough and that a more proactive approach was required to create a fair and equal playing field.