Yes, absolutely both of those are factors. Walkability is a classic tragedy of the commons.
Which is why it is important and justifiable to occasionally decide collectively to do things that may be perceived as “anti-car”, such as removing (or refusing to build) new car-serving infrastructure such as parking spaces.
Which is why it is important and justifiable to occasionally decide collectively to do things that may be perceived as “anti-car”, such as removing (or refusing to build) new car-serving infrastructure such as parking spaces.