Antagonist?
Thanos，the central figure of the Avengers 3,antagonist.
Everyone has his own ideals and his own beliefs. Strong-willed people, tend to be successful. Thanos has his own ideals. From my understanding,it is to maintain ecological balance. When the universe's self-regulation mechanism failed, he decided to destroy half of the universe's creatures in order to maintain the balance of the universe. His original intention was good, but the method was too radical and contrary to secular ideas, so he became a antagonist in the traditional sense.
I believe that in the end he should change his methods, but his belief in maintaining the balance of the universe will not be shaken.
Ideals and beliefs are very important. The correct and firm ideals and beliefs are necessary. However, method is also very important. It should not be too radical or too conservative. It should be consistent with the society in which it is based, mainstream thinking, and the direction of social development.
The road should be taken step by step, as long as the direction is correct, the steps need not be too large.