Liberty is the chance to use our gift of life to its fullest advantage. Without basic liberties, mankind is held back from reaching its fullest potential. That is why liberty curtailing forms of government like Communism and Socialism are immoral, or at best, amoral.
They have called for his opposition, his impeachment, his imprisonment, and his death and the death of other Republicans, both implicitly and at times explicitly. The anti-Trump movement on the left has a particularly vicious streak. So called "comedian" Kathy Griffin recently released a photo of her holding up a bloody, fake severed head of the President.
Remember our fallen warriors.
Whatever the reason, these men and women have chosen a vocation that routinely requires sacrifice, sometime of the ultimate kind. That is why today is their day, a day for them to be proud, and the rest of us to be proud of them.