Even the blood clots that were found with AZ and J&J are happening with the virus itself at higher rate.
So it's just a simply choosing lesser risk.
There was also heavy disinformation campaign against AZ because AZ was the only non-profit vaccine made and its presence was standing in the way of Sputnik V being introduced into EU[1]. J&J has similar issues and it wasn't affected as much. Pfizer[2][3] was also targeted similarly, but the problem was that not much could be found on mRNA vaccines. I guess the worst one was some inflammation of hart in young people that resolves on its own.
[1] https://www.biospace.com/article/russia-sees-opportunity-in-...
[2] https://www.rferl.org/a/russia-pfizer-covid-disinformation-s...
[3] https://www.euronews.com/2021/04/29/eu-slams-russia-and-chin...
The "Russian disinformation" argument doesn't really work either, because Russia targeted mRNA vaccines specifically. The Sputnik vaccine (in theory) has the same problem as the AZ and J&J vaccines, also being based on viral vectors.
Get it, whatever it cost you, because it's your duty.