Yeh why not? Going to work in the first place would have been a risk so what difference does getting it, recovering and returning make?
Same could be said of going to get your hair cut, having a meal out, doing your food shop, going to the Drs.
When the original lockdown ended there was no testing and no vaccine and people rushout out without knowing their own status in terms of infection and rushed to see family and friends in a bubble with a bigger risk of infection relying on symptoms only. That was a bigger risk than going back to work in covid safe environments using what we know to advise us.
Would you leave the house and buy a pint of milk knowing there is a risk of Covid?