We are learning something today in finding a way out of this matter.
Neglect of Duty is a serious sin. Piety in place of Duty isn't piety at all. Duty First, piety follows.
From the Catechism:
The duties of citizens
2238 Their loyal collaboration includes the right, and at times the duty, to voice their just criticisms of that which seems harmful to the dignity of persons and to the good of the community.
2239 It is the duty of citizens to contribute along with the civil authorities to the good of society in a spirit of truth, justice, solidarity, and freedom. The love and service of one's country follow from the duty of gratitude and belong to the order of charity. Submission to legitimate authorities and service of the common good require citizens to fulfill their roles in the life of the political community.
2240 Submission to authority and co-responsibility for the common good make it morally obligatory to pay taxes, to exercise the right to VOTE, and to defend one's country:
[Christians] ... participate in all things as citizens and endure all things as foreigners. . . . They obey the established laws and their way of life surpasses the laws. . . . So noble is the position to which God has assigned them that they are not allowed to desert it.46
Those "duties" of citizens sound nice in a society in its right mind as the USA used to be. As a Catholic, catechism or no catechism, I have no obligations to Obozo other than his destruction. That goes double for quislings in the GOP, the nominal opposition party which normally serves as Obozo's footstool.
Obozo eagerly supported by such noted "Republican" toadies as Myth Romney, John McCain, Robert Dole, anyone named Bush, Weeper of the House John Boehner, Kevin McCarthy, John Cornyn and all too many other "Republican" quislings share a passion to sell this nation down the river to the same sort of Wall Street barons who gave Connecticut the likes of Lowell Weicker and his state income tax.
My duty is, by any means necessary, to offer full resistance to such quislings. Most of these quislings favor baby-killing, "gay" everything, gun grabbing, reducing citizens of modest means to conditions of misery, and, inter alia, ever escalating taxes burdening everyone other than themselves.
The simple answer to the three cited catechism sections is that when the choice is between Hitler and Stalin, the response should be organizing an underground against both not sitting around weighing the respective merits of Hitler and Stalin to decide who should be the blood-soaked dictator du jour. By a narrow margin, no doubt. Likewise, military service is owed to neither but, if the opportunity presents, perhaps military service, uniformed or not, against both.