One has an obligation to attend a valid, licit and moral mass, under pain of hell, regardless of the priest's views (assuming he's a valid priest). The resistance masses are not the only masses.
If you're talking about the novus ordo mass, I agree, it's heretical. Outside of this, you're being extreme.
The SSPX is very close to being 'red lighted' in my opinion, but not yet. Sunday masses, by and large, still fulfill one's sunday obligation, even if the sermon is full of propaganda and the church is full of sheeple. Until the sspx formally becomes indult, and outside of marriage masses where the novus ordo "priests" are involved, I would attend if I had to. The obligation to honor God through a valid and pleasing Mass outweighs any ancillary questionable orthodoxy.
You might JUSTIFY going to an SSPX Mass perhaps, but you cannot CONDEMN those who choose to abstain at this time. There is a difference.
I suppose it comes back to "red light" vs "yellow light". Yellow light it's up to your discretion whether you want to hit the brake or hit the gas. Red light you have no (moral) choice but to come to a stop.
Your idea about holding your nose through propaganda, etc. does not ring true for me:
1. If you have any children, they are going to absorb much more of it than you are.
2. You will be surrounded by (mostly, with a few exceptions) the worst of sheeple, who will influence you, your spouse, and your children. These are the type who don't have the fortitude to start OR EVEN SUPPORT EXISTING Resistance Mass centers. Remember that there are a few Resistance locations with full chapels, and weekly Sunday Mass. But the nearby SSPX chapels are hardly empty! They are populated by those who are afraid of getting on a priest's bad side, afraid to speak up for their beliefs -- basically ANTI-MARTYRS (i.e., the opposite of a martyr). In short, these are the opposite of the type of people I admire or want to associate with. And I certainly don't want my children to imitate such cowards and sellouts.
3. Your argument could have been, and in fact WAS, used in the 1970's to justify continued attendance at the Novus Ordo, at least until a Trad option appeared. But the record shows that the Traditional Movement was founded by those who left the Novus Ordo first, and got their Trad Mass much later. The pioneers and heroes of the Trad movement all left the Novus Ordo regardless of having a Trad option immediately available. After all, it's impossible to start building a lifeboat when you're still messing about on the sinking ship.
It's not just about the Mass. It's about the Faith. Those who think it's about the Mass end up at the Indult -- they have their Mass, and they're happy. But it's not just the Mass. It's the whole FAITH that was attacked and replaced at Vatican II.
The SSPX thinks they have us by the unmentionables since they control 90% of the Mass centers in the US. Perhaps they're right -- I know a lot of Catholics sympathetic to the Resistance but who attend Mass at the SSPX because they have no better choice.
It's a shame more people couldn't stick to principles, and basically not let the SSPX get away with it
. But in fact, they seem to be getting away with it, because they dangle Sunday Mass over our collective heads.
PS. You are also forgetting that if it was legitimate to leave the Novus Ordo/Conciliar Church in the 70's and onward, it's equally legitimate to leave an organization (SSPX) that has unlawful commerce (kind of like "unlawful carnal knowledge") with said group. The SSPX is pushing Novus Ordo priest (or "priest") witnessed marriages, they are toning down resistance to Vatican II, etc. and that is sufficient reason to leave and not look back. I, and my children, don't need to have our defenses disassembled so that the worst heresy ever (Modernism) can spill over the broken rubble of the castle walls and infect our minds and hearts.
We have a right to keep our Faith intact.