Was it because the insurrectionist law in place only applied to specific situations many years back. Trump didn't have a guilty verdict for Jan 6th etc?
The court said that 18 U.S.C. 2383 is the only federal law on the books right now and Trump was not convicted under that law. The court left the door open for congress to pass additional laws in the future that could bar an oathbreaking insurrectionist. Here's a snip from the case:
>>>Shortly after ratification of the Amendment, Congress enacted the Enforcement Act of 1870. That Act authorized federal district attorneys to bring
civil actions in federal court to remove anyone holding non legislative office—federal or state—in violation of Section 3, and made holding or attempting to hold office in violation of Section 3 a federal crime. §§14, 15, 16 Stat. 143–144 (repealed, 35Stat. 1153–1154, 62 Stat. 992–993). In the years following ratification, the House and Senate exercised their unique powers under Article I to adjudicate challenges contending that certain prospective or sitting Members could not take or retain their seats due to Section 3. See Art. I, §5, cls. 1, 2; 1 A. Hinds, Precedents of the House of Representatives §§459–463, pp. 470–486 (1907). And the Confiscation Act of 1862, which predated Section 3, effectively provided an
additional procedure for enforcing disqualification. That law made engaging in insurrection or rebellion, among other acts, a
federal crime punishable by disqualification from holding office under the United States. See §§2, 3, 12 Stat. 590. A successor to those provisions remains on the books today. See 18 U. S. C. §2383. . . .
Any congressional legislation enforcing Section 3 must, like the Enforcement Act of 1870 and §2383, reflect “congruence and proportionality” between preventing or remedying that conduct “and the means adopted to that end.” City of Boerne, 521 U. S., at
520. Neither we nor the respondents are aware of any other legislation by Congress to enforce Section 3. See Tr. of Oral Arg. 123.<<<
This implies that a civil action to remove an an oathbreaking insurrectionist from office or to prevent an oathbreaking insurrectionist is authorized by the 14th Amendment, provided it reflects “congruence and proportionality.”