The election is merely the hiring process. Getting elect is necessary, but not where the job ends. It is post-election when the constituents start hammering you with their demands and as their representative you have to find the general sentiment of the crowd.

It is true that not everyone believes in the democratic process and, as such, will never speak to their representative again, if they even managed to during the election campaign, but then they're not really constituents in any meaningful sense and can be safely ignored.

The constituents would never want you to actually follow through with your platform as, even if well intentioned, is long outdated by the time you are able to do anything with it. Making decisions based on outdated and incomplete information would be considered horrendous by any reasonable person.

A platform merely provides points of interest to open the door to talk to the people who are interviewing you for the position. It's a cover letter, so to speak.

There is good reason why the constituents will show up at your office following the election to go over what actually needs to be done, just as any employer would. This is where the actual direction is set. There may end up be some overlap with the platform here – even a broken clock is right twice a day – but only after deeper consideration.

If you are not speaking to your hired representative regularly to ensure that your input in the direction is given, you're not participating in democracy. And, well, I guess as the saying goes: If you don't participate you can't complain. What is certain is that representatives, even the best ones, are not mind readers.