You're insulting all the people who suffered even more oppressive regimes than Stalin or Mao as a consequence of NOT arming themselves. Chileans suffered Pinochet as a consequence of lack of oppression of the fascist opposition during Allende. Spanish suffered Franco as a consequence of lack of oppression of the fascists during the Spanish Second Republic. Oppression is sadly a tool that must be used, as sparingly as possible that's true, to prevent reactionary elements from maintaining or reinstating even more oppressive structures.

People everyday in post-colonial countries suffer immeasurable despair as a consequence of lack of revolution. If you criticise Stalin or Mao and consider them undesirable and illegitimate, you should be even more convinced of the illegitimacy of current western governments that impose imperialism on the global south. Every day that we delay or refuse these armed revolutions, we're perpetuating this system which is even more harmful than the USSR or communist China by any metric possible.