Movie#63 Crazies

At best it can be called as 'cousin' of Resident Evil or 28 Days/Weeks Later. The storyline poses a lot of questions at the end. Agreed that fiction work should be seen without an analytical eye but a question would be a question anyways. It stars Timothy Olyphant and Radha Mitchell.
The gist of the story is that in a town, the people turns into apathetic killers with prominent veins on their face. It happens so quickly that the police officer suspects the water supply. He is in a race against time to save his pregnant doctor wife with the help of his trusted deputy. The happenings resemble a mix of the previously mentioned movies. While on the run they discover what had caused the behavioural change and what extreme step on containment was being taken by the authorities.
The few questions that pop up are
1. All network and communication links are cut off except electricity. Huh?
2. Ok maybe this would be like a spoiler but I still need to ask. The inhabitants turn into apathetic killers but how come they recognize their relatives or friends and remain loyal to them only?
3. How do they survive a containment measure like that within the danger zone and in a truck?
4. According to information they gather, the 'affection' is like Lycra advertisement–  Either You Have It Or You Don't. Funny that only the people in the camera shooting frame comprises of the 'You Don't' category.
My personal rating will be 2.5 out of 5…