I would argue that it would impact the effectiveness of the effort, but the intention is just as important.
Like if you want to make the world a better place, you can pick up litter in your local area. You could volunteer at the library or conserve energy in whatever way is easiest for you. The desire to move forward is critical, because nobody has all the information. Nobody can know all the angles, and be aware of every impact. Everyone is just doing the best they can with the information they have.
Wanting to be better informed is also a progressive ideal. Know better, do better. We might discover that something we thought was beneficial is actually harmful. The difference between a conservative choice and a progressive choice is that when new information demonstrates that behaviors conflicts with values, the progressive changes their behaviors while a conservative changes their values.
I oppose it simply because it doesn’t work. It is not a deterrent, and it does not serve justice to put people to death, and it costs far more to execute someone than it does to rehabilitate them (the most expensive alternative - I’m not suggesting rehabilitation is an option for everyone).
And sometimes we execute innocent people. Like, how many of your family members would you be willing to put to death to keep the death penalty? Every innocent victim of the death penalty had a family, and that family never imagined it could happen to them.