Question Author
Perhaps people should do that, but the majority don't -- and with good reason, really, as they are also electing representatives to a national government that spends a great deal of its time discussing national issues (and, for that matter, foreign policy).
Parliament is now a national legislative body and really ought to be designed as such. If people want to retain the constituency link, and I can understand this, then it's possible to make constituency elections more representative than FPTP delivers. One could even throw in a reform of the local government system while you're at it.