Because the J&J vaccine was found to cause clotting in some people.
What does a blood clot have to do with an aneurysm?
The thread was about Casten’s daughter. She was young and healthy.
So is Bieber’s wife
Here is article with 3 cases documented regarding aneurysm 3 days after receiving clot shots...
Intracranial aneurysm rupture within three days after
receiving mRNA anti-COVID-19 vaccination: Three case studies.
Surgical Neurology International
https://surgicalneurologyint.com/wp-content/uploads/2022/03/11501/SNI-13-117.pdf
So vax-induced aneurysms may be another cause of vax-induced clots.