In the "Declaration of Independence of the Democratic Republic of Vietnam" speech, which crimes by the French are most severe?

In declaring independence for the Vietnamese people, Ho Chi Minh presents a compelling case against the French occupation. He even uses France's own Declaration against them at the beginning of the speech. Ho lists a number of grievances in the speech that justify independence for his people. The idea that the French have forced opium and alcohol on the people of Vietnam is a major grievance and is severe because it has cultural and health implications. Another grievance that is severe enough to justify independence is France's lack of protection from the aggression of Japan during World War II:

In the autumn of 1940, when the Japanese Fascists violated Indochina’s territory to establish new bases in their fight against the Allies, the French imperialists went down on their bended knees and handed over our country to them.

The above statement from Ho is telling. If the French did not care enough about the land of Vietnam to commit its own troops in its defense, what rights do they have to Vietnam after the war? France essentially left the land to be defended by Ho Chi Minh and it is reasonable to believe that he should be the ruler of a free Vietnam now. Despite this reasonable assumption, the French violently suppressed uprisings after World War II.