I give you the reason in your thoughts of freedom in the era of Thich Quang Duc in the 60's did not excist the right of free expression the government controlled the people at will in the current era there is a little more freedom of expression in comparison with the 60's .
We are all free to think what we want, we are free to discuss what is wrong with the government. We can criticize that this is not working in our country and in which the government is failing. Freedom of expression is everyone's right ... it hurts that monk Thich Quang Duc lived in a different "epoch" to ours.
In the current religion theme, every human being is free to decide which religion he wants to follow in the 60's. The Catholic religion had a lot of influence in the decisions of the governments; At present, the Catholic religion does not have the same weight as before.