I think that in general, many Catholics are afraid of "breaking the rules", in this case, mind you, clearly unjust laws which they ought to resist, even if it means doing something like forging information.
(Not recommending it, but in theory it is an option. Remember that priests who wanted to get into England during the Penal Times to minister Sacraments to the Faithful HAD to come into the country under pseudonyms and forged passports, or they'd be thrown in jail, banished, or even executed. Despite what would otherwise appear to be lying, the Church did not condemn the measures of these priests in such desperate times. Maybe there is something we can extrapolate from this).
Of course, there is the more prudent option of abandoning the school and encouraging all families to instead engage in homeschooling. It is, in my opinion, an attachment to bricks and motars, so to speak, that is holding the SSPX there back from this hard yet obviously right option, rather than encourage souls to get the poison.
You can't be on good terms with an evil regime. You shouldn't WANT to be.
The SSPX desire to be on good terms with the satanic world, Vatican II, the Conciliar Church -- no good will come of it, I can tell you that.
This especially when considering that Jacinda Arden (the PM of NZ) was
named a "World Economic Forum Young Global Leader" in 2014. Anyone who has ties to that insidious Fabian Socialist institution, is clearly our enemy, clearly a whited sepulcher!
But getting back to my original point, I think many people today, Catholics and non-Catholics, falling into the kind of mania that Hilaire Belloc described in his book
Europe and the Faith:
But the sense of an absolute civil government at the moment of the Reformation was something very different. It was a demand, an appetite, proceeding from the whole community, a worship of civil authority. It was the deification of the State and of law; it was the adoration of the Executive.
"This governs me; therefore I will worship it and do all it tells me." Such is the formula for the strange passion which has now and then seized great bodies of human beings intoxicated by splendor and by the vivifying effects of command. Like all manias (for it is a mania) this exaggerated passion is hardly comprehended once it is past. Like all manias, while it is present it overrides every other emotion.
(pg. 162)