My group of friends lost a few of our group in a car accident when we were in our early 20s. The ceremony at the church was very respectful, as was our attire; there were nods to our friend in the service and a few jokes. We then had the tea and sandwiches wake with family etc before our group (and a few of the family) went on to our local pub. We talked, laughed, sang and shared anecdotes well into the early hours. It was by all accounts "a good night" save for the obvious omission of our friends. But we didn't take pictures (videos weren't really a thing 20 years ago) as there remained the air of the circumstance throughout the evening. It was respectful but a fitting tribute to our friends and the parents said it was exactly what they had imagined us doing, because it was what their children had enjoyed doing the most.
What the slaters have done under the guise of a "fitting send off" is frankly crass and in my opinion poor taste, especially because they knew any recordings would likely be made "public", and surely they'd have known that would have put them under scrutiny?