Their visas don’t have to be revoked. They are already invalid and were once the asylum claim was filed. The asylum claim gets them a stay of removal while their asylum claim was pending. Shit gets misreported in the press and and it’s complicated. Without records we don’t have, it’s impossible to tell but here is the likely sequence of events:
1. Under expedited removal they will be found to have committed fraud or misrepresentation to gain entry.
2. A sped-up “credible fear removal” will be conducted, which is required when you want to use expedited removal on someone who has a pending asylum claim.
3. Removal
A few more points, yes family members of terrorists are removed or deported all the time, and visas revoked. Open question is whether this dude is a “terrorist.”
Second, yes it’s almost certain that they used fraud to obtain their visas. In fact, for consular purposes it’s considered prima facie fraud if you file a claim or try to adjust status within a certain window of obtaining a visa or being granted entry on a tourist visa, as you are REQUIRED to affirm that your intentions are to stay for a short term. The fraud is baked in.
Third, a genuine asylum claim can overcome that fraud but a bullshit one cannot.
Fourth, this guy’s claim has a high chance of being bullshit. Many, many are. There are 3.6 million in the pipeline and for decades there hasn’t been much scrutiny. Cases from Egypt and authoritarian states are especially bullshit because in nearly all cases, people with a real specific fear of being targeted can’t get passports and aren’t allowed to leave.
Worst case you can (likely) say about this family is that their dad’s actions brought a level of scrutiny to their pending claims and actions to get to the United States that could have been avoided if this guy had kept his head down and not firebombed people. But the treatment they are getting likely completely justified under existing law.
I’d expect a similar, but less aggressively public, response from most admins.