These are not political reasons. I'm for many years now trying to avoid flying on the 737 MAX and 787. Not because I dislike the planes even as a passenger, or because I worry about crashing, or because I have a political agenda. I want to use the little bit of voting with the wallet I have. This is the core of how our system works.
I understand that in the grand scheme of things this is not really doing anything, but if a sufficient number of people make airlines uncomfortable they will increase the pressure on Boeing to improve their processes.
The current duopoly/monopoly on aircraft manufacturers is preventing innovation in the space and I do not appreciate this a single bit.