The likely reason for the attack is an act of hacktivism as a way for the hacker to spread messages for their own agenda.
From the complete information given, during the morning of a website launch for a government-sponsored program, an unknown political rival had access to the server and the content showed human rights campaigns.
This is quite different from the original intent of the message to be sent. In this case, the reason for the attack is that the hacker wants to pass their own message to the people.
