Vaccines aren't a factor as they weren't available when any of the variants emerged. The emergence can't be either the vaxxed or the unvaxxed's fault. Nobody's responsible or culpable, it's entropy.
Of the current strains which are active everywhere : - Alpha emerged in the UK before vaccines - Beta in SA before vaccines - Delta and Gamma in India before vaccines.
Of the current variants of interest: - Eta and Iota come respectively from France+UK and New York City, both before vaccines. - Epsilon (not of interest anymore) came from California before vaccines. Same for theta in the Philippines. - Kappa and Lambda come respectively from India and Peru, both before vaccines.
As for who's at fault for spreading : vaxxing 60% of the population only drops Deltas R_0 from 4.6 to 4.3.
It is immaterial whether you are vaxxed. The virus is smarter.
See my comment for details : https://news.ycombinator.com/item?id=28076327