Biden changed his mind about going to the inauguration by train

U.S. President-elect Joe Biden refused to go to his inauguration, scheduled for January 20, on a train of the national rail passenger company Amtrak.

This was reported by CNN with reference to two sources familiar with the situation. According to them, Biden was going to go to Washington for the inauguration ceremony by train from Delaware, but changed his mind to do it for security reasons after the rallies.

How is that possible? A president elected by an absolute majority is afraid of his own people?