Why did top LDS leadership not attend the memorial for 10 members killed in Lesotho YW trip?

Various outlets have covered this tragedy. In a recent episode of The Mormon Newscast (1 hour 23 minute mark) Rebecca Bibliotheca asked why no leadership from SLC attended the memorial. The Prime Minister of the country attended, why did SLC not send an apostle?

I suggest that it was because the memorial was held in July and it is common knowledge that July is the month that apostles are given the time off for personal vacations.