b/c this is something so common it no longer becomes news, just another sad reality of Africa
u really think this is the first time a massacre has occurred in Africa in recent history
1 - Obito isn't smart
2 - again Obito isn't smart
3 - Kushina could've lost control
4 - Obito knew he was/is a fodder ninja and wanted Sasuke to do his dirty work for him
5 - they needed to gather information about who the jinchurukis were, where they were, and what they were capable of
plot
he learns rasengan in like 3 weeks, masters sage mode in like a month, tames the kyubbi in a day
he used to be interesting but then became a gary stu