If you want to build a vibrant community that can cooperate on projects with combined efforts, but also profiting from their various experiences and perspectives, then yes, you better position yourself in such a way – which is inherently anti-right-wing.
Regarding the political views:
Over at the other thread I elaborate my point that for some community members, it might indeed just be about a conflict with their personal political stances. But there is a group of people for whom this is not about plain discomfort, but it is about not feeling welcome, safe, or even being threatened and re-traumatised.
We need to be aware that even a welcoming conference always ostracises some people. There are the active decisions like dropping problematic sponsors, those may be the loud ones.
But then there are the silent non-decisions through which we cause people to avoid community spaces. Those might feel like passive ones, but they are not, as we can know what we’re allowing to happen there.
If I need to choose between the marketing effects for a sponsor and the well-being of several community members, I know which choice to make.
Additionally, what we build is political: It is shaped by our perspective on the world, is used by political actors and this usage might influence its further development. The software we build also again shapes the cases where it is used. Code is law.