As for as fighting vs. cultivating the interior life, you can and should  do both.  The further you go in the spiritual life, the more clarity of vision you'll have, and thus, the more effective you will be against error.

Some may be better at one or the other.
Praying and taking Sacraments as frequently as possible should be the goal of all Catholics. Reading intellectual/spiritual materials is desireable but not possible for all.
For instance it would take years to read, study and understand all the works of the Fathers of the Church. By that time for me I will be dead and of no use to anyone. Although I want to and feel compelled to read and learn the dogmas, canons etc, as it makes me feel closer to God and is enjoyable for aesthetic reasons, I am just not capable of reading it all.

prevat, one could attend Church and commiserate with like minded Catholics secure in the Faith that they would go to Heaven as would most of their family and friends. Now the "Community" of the Church is broken.

What stops them appears to be the pragmatic concern that, if they did such a thing, they would instantly take on the character of eccentrics.  But they already have that character in the eyes of the world, and it shouldn't matter anyway.

What stops them is either $$$ or actual fear of reprisal, that is DEATH.

All traditional Bishops need to start meetings right away with the purpose of bringing all Traditional sects together. There must be a call for ALL Bishops who have doubts regarding v2 to come together. I am sure there are even many in the conciliar church. Even tptb running the conciliar church could not get it together fast enough to arrange car crashes for so many Bishops.

Start with what was the accepted dogma prior to v2.
Establish the True prev2 Catholic Church and elect a leader.
Everything else is confusing and leading to the ruination of souls just as badly as v2 is doing.

Because there has been no leadership, lone wolves are going back to no popes since medieval ages. !!!
Everyone is coming up with different conclusions because there is no leadership.

But "fighting" shouldn't come from a place of rage.

What, me rage?  :really-mad2:

For Catholics to maintain a headless Church for fifty years while maintaining they are under no obligation to correct this matter or that they are powerless to do so until some undefined "authoritative body" rising from the ashes decides to take proper action.  Chimerical.  

So far as the "obligation" of the SSPX to accept error is concerned, look in the mirror.  Your logic applies to your own position with far more consistency viz. electing a new Pope or accepting in toto VII and the reforms.

The Church is not headless, Christ is the head, we are only without a Vicar on earth.  Which is bad, I agree.  Also there is no Church teaching that God is limited as to a timeline.  God is never limited.