Opening of high schools near central Auckland/western Auckland area

Michael from Morningside

My daughter goes to Mt. Albert Grammar. I just received an email from Auckland Regional Public Health Servvice (ARPHS) saying a second student at MAGS has just been confirmed as having COVID-19 but was infectious more than two weeks ago. However, ARPHS "is asking all students and staff members (at MAGS) to get tested" to "help identify if there are any undiagnosed cases." Then later the letter states, "MAGS remains safe for all staff and students to return on Monday 31 August and lessons resume at 8.40 am."
The two statements seem like a serious contradiction. If the school is "safe", why have everyone associated with the school get tested? I believe high schools in this area of Auckland are not safe now, especially with a new Covid cluster discovered in Mt. Roskill. These high schools should stay physically closed for at least another one or two weeks (or at least stay closed to students 15 and older since these students can stay home on their own). Or at least MAGS (with a student enrollment of 3,000) should stay closed until every MAGS student is tested, since the ARPHS stated it wanted every student in MAGS tested.
I will write to the principal of MAGS, the Ministry of Health, and the political parties. If you are concerned about our community health, I hope you will also write.