ok. i can accept this. i still think this looks stupid in the movie though, because it takes the corleone family, a powerful, respected mafia organization and turns them into terrorists. it makes it seem as though the only way they can operate is to send their men on suicide missions. compare this to the baptism sequence in the original and it doesn't hold a candle.
The suicide missions and the stupid killing of Lucchesi make sense. Lucchesi was a powerful Sicilian Don and could not be easily approached. Storming in like Rambo would fail too. So it had to be sneaky... They attacked the man in his own fortress, that's like Barzini's men walking into the Corleone mall.