I think you are looking at it now with hindsight, at the time most people were worried. I was in good health on no meds no issues, so not worried in the slightest. I did have an elderly mother though, so on the advice that I was slightly less likely to get it and pass it on to her I had two and the booster too. The other reason I had it was to allow everything to reopen quicker and damage the economy slightly less.
Overall they are as safe as getting covid, so it was no harm in having the injections for me, and the saved the lives of lots of elderly and ill weak people.