mRNA is a tricky technology. Several major pharmaceutical companies have tried and abandoned the idea, struggling to get mRNA into cells without triggering nasty side effects.
Hmm, now tell us about heart problems weeks later. My guess is that intramuscular simply delays the damage long enough they can deny it was due to the vaccine.
Now? Some of us knew this before the SARS-COVs-2 outbreak
If you've been following the story of Moderna
https://www.statnews.com/2017/01/10/moderna-trouble-mrna/
https://www.thestandard.com.hk/breaking-news/section/4/179175/HKU-study-warns-against-accidental-vaccination-into-veins
Hmm, now tell us about heart problems weeks later. My guess is that intramuscular simply delays the damage long enough they can deny it was due to the vaccine.