31 Everyone knows, however, that revolutionary uprisings—except where there is manifest, longstanding tyranny which would do great damage to fundamental personal rights and dangerous harm to the common good of the country—engender new injustices, introduce new inequities and bring new disasters. The evil situation that exists, and it surely is evil, may not be dealt with in such a way that an even worse situation results.
Source: Populorum Progressio (Vatican.va)