After the Battle of Hogwarts, the wizarding community began to learn the details surrounding the death of Albus Dumbledore and the atrocities carried out in the school under Voldemort's command. It was only a matter of time before there was mass panic among parents, and the message was clear: Hogwarts was not safe. Parents began pulling their children out of school, and many teachers ran for cover. Without enough students and willing teachers, Hogwarts closed its doors.
Hogwarts was able to reopen a year later, just in time for the start of term in 1999, but it took months of dispute and less than half of the students returned. The reopening also came with the following condition: Aurors were to be hired to permanently guard the school and grounds to ensure the safety of the students and staff.
The year is now 2005. Life in the wizarding world is slowly receding to the level of normalcy it maintained during Voldemort's missing years. The Ministry of Magic continues to be blamed for how the Second War was handled, and to this day many do not trust that the Daily Prophet would report any current threats and live in a constant state of vigilance, convinced that a new Dark Lord is rising.
Life at Hogwarts has normalized, if you don't count the tension between the Aurors and the teachers that seems to be growing and bubbling beneath the surface Aurors follow their orders, dutifully upholding their strict protection of the school, but their feelings are divided. Some Aurors are simply happy to be the reason that Hogwarts was able to reopen at all. Others, on the other hand, resent guarding a school where nothing happens other than some underage mischief. It's hopeful that in time, Hogwarts will return to a place where students are allowed to roam freely but for now, this is the best the Ministry of Magic can offer.
While most of the main participants of the war were killed in the final battle - Harry Potter, Ron Weasley, and Hermione Granger, to name a few - many witches and wizards have done their best to put the massacre behind them. After all, who wants to be reminded of the reign of terror that had struck fear into the hearts of even the bravest of wizards?