There obviously is a political motivation behind celebrating it now...maybe Cameron thinks he can gain support by "commemorating" now rather than wait till he is no longer in office.
Honestly, what a load of rubbish to say that

It's perfectly normal to commemorate something on the day it happened - Twin Towers is one, Munich air disaster another, and Hillsborough etc.

You WOULD celebrate something like the end of the war.

I can look at your statement and say you are scoring cheap shots being anti Tory so you are no better.

To me, we should mark the awful start of the War and try and imagine the scariness of it all and the terrible things our brave boys had to go through.