@Fergoose said:

spoilers

This film showed promise. A fairly well handled set-up and then a genuinely interesting scene in Amsterdam with a drunken author making a deeply insensitive but thought provoking rant. Hopes were high following that scene which made the following scene all the more surprising.

Our young protagonists go to the Anne Frank museum and listen to the heart breaking tale of family members, in hiding for months on end, ultimately being caught and exterminated by Nazis. Emotions understandably run high and, what more natural response to such a sombre occasion in Anne Frank's attic, than for our star crossed lovers to embrace for a lustful and prolonged first kiss, to the accompanyment of warm applause from surrounding tourists. All under the nose of photos of the murdered Frank family.

Once I'd picked my jaw off the floor and the film continued in an unrealistically manipulative tailspin I was able to reflect that this was the most asinine and wrong headed single scene I have ever seen in movie history. Can anyone think of anything that would compete with this?

I have not seen this movie but, going only by your description above of this scene, I'll posit an explanation for your consideration.

The Frank family was doomed. They lived out their final days in that attic. These cancer kids were also doomed. But, in truth, we are all doomed. Whether the Nazis or cancer or a vehicle collision or even just dying in your sleep at a ripe old age, ultimately it doesn't matter, we all live on borrowed time. The human spirit, then, is to focus, not on the doom, but on living and loving to the fullest with whatever time we have. This realization, this reality, makes their cancer less "unfair", less cruel, and empowers them to claim their equality with every other human no less. This realization alone is their ultimate triumph over cancer, as they contemplate and embrace the fullness and frailty of the human condition, just like everyone.

If this resonates with how the rest of the movie played out, it may be that it is indeed what they were trying to say by how they set up this scene.