Lack of interest? Ya, that's putting it mildly in a lot of cases. While we do have large parades and veterans march and flags fly and some do realize what this DAY IS REALLY ALL ABOUT, most think it's just an excuse to get time off of work, eat burgers and get drunk. 
A lot of Americans especially the younger generation have no idea about our history and WWII. Many of them don't even know about the wars that their country was involved in. It's not all the kids fault, it's our schools who teach social studies and NOT HISTORY. A sad state of affairs.
Luckily we have sites and forums like this and TV like the History Channel, etc. Hopefully we can keep this alive and teach our younger generations about what's really important in life.
We do have some really good teachers who bring in their own curriculums and introduce the children to our REAL history. When the kids learn these things they are fascinated, astounished, horrified and truly interested in what occured.
Those who forget history are doomed to repeat it....
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"