I’m pointing out how shallow and unhelpful your comment is. I provided an analysis as to why a seemingly obvious solution has serious problems, you made an unhelpful comment that seems to suggest that commenting on the cost of a project means I’m confused about the political acceptability of a project, rather than the fact I’m trying to demonstrate why the obvious solution might have some problems. Which has nothing to political acceptability, but is simply a comment on the poor value-for-money that specific solution represents.