1) Traditionally, the SSPX taught us that we could not attend Ecclesia Dei chapels;
2) One of the reasons was that, even if everything said and done were Catholic and orthodox, they were still omitting to teach the faithful about the poisons contained in the doctrines of Vatican II;
3) And through this omission, these chapels represented a danger to the faith;
....
9) Do not his omissions represent as much a danger to the faith as an indult chapel, insofar as both refuse to condemn doctrinal error?
10) And if that is the case, was not the SSPX wrong to have formerly condemned indult chapel attendance on this account;
11) Or if they were correct, does it not hold perfectly true against the chapels manned by silent priests today?
12) Or perhaps this particular reason for avoiding indult chapels was simply another reason to avoid them, but not sufficient to ban attendance at them?
Those "dangers to the faith" are dangers to children and those that do not know their faith. When I was single, I would have gone to an indult mass if that was all that was available. That was never for me a reason not to go to an indult mass. The reason why I would not go to an indult mass was because I had doubts about the validity of the priests. PERIOD!
The SSPX use to teach that as the main reason. Then in like 2006
The Angelus magazine came out with an article saying that the New Rite of Episcopal Consecrations was valid (and thus they could ordain valid priests in the Novus Ordo). They switched their teaching! Moreover, the SSPX stopped conditionally ordaining the Novus Ordo priests that came over to the SSPX. Needless to say, if that is true, then there is no reason for a person who knows his faith, to not go to an indult mass if that is all that he has. AND, if they find an indult mass with a priest that is better than their SSPX priest, there is no reason to go to the SSPX.
I will not go to an indult mass because I have doubts about the validity of the priests. If the priest is not a priest, I might as well do a 15 decade rosary at home!