First, you're assuming the outbreak would be slow. What if it isn't? In World War Z (God, I love that book) a zombie first developed in China and the government chose to cover it up; then despite the fact that they knew they had an outbreak they still didn't stop black market organ donations to around the globe; some of the organs were from infected people who hadn't turned yet, so the zombie virus showed up in a lot of countries.
Second, you're assuming that only special dead (those who had been infected by zombies) are the only ones that could rise. In the Walking Dead comics (I don't think the TV show has gotten to this revealation yet) it's not just people who were bitten that can rise; everyone who dies becomes a zombie. So that means deaths from natural causes, murders, suicides, etc. all come back.
Third, methods: Fire would probably work but it would be slow; so now not only do you have a zombie coming after you, you have an on-fire zombie coming at you; zombies are also incapable of feeling pain so they'll keep coming at you. Decaptation/headshots will definitely do it but for decapatation you'd have to get close which could be very dangerous and headshots are not easy to do. Even people who are trained to use guns could find making headshots very hard.
Fourth, there's also good old human panic that could make the situation worse. Denial, mass hysteria, etc. could potentially get a lot of people killed. It only takes one infected after all to infect a group of people.
I could be wrong but I don't think zombies brain actually function; well, at least they don't function like human brians since zombies don't need most life functions anymore.
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First, you're assuming the outbreak would be slow. What if it isn't? In World War Z (God, I love that book) a zombie first developed in China and the government chose to cover it up; then despite the fact that they knew they had an outbreak they still didn't stop black market organ donations to around the globe; some of the organs were from infected people who hadn't turned yet, so the zombie virus showed up in a lot of countries.
Second, you're assuming that only special dead (those who had been infected by zombies) are the only ones that could rise. In the Walking Dead comics (I don't think the TV show has gotten to this revealation yet) it's not just people who were bitten that can rise; everyone who dies becomes a zombie. So that means deaths from natural causes, murders, suicides, etc. all come back.
Third, methods: Fire would probably work but it would be slow; so now not only do you have a zombie coming after you, you have an on-fire zombie coming at you; zombies are also incapable of feeling pain so they'll keep coming at you. Decaptation/headshots will definitely do it but for decapatation you'd have to get close which could be very dangerous and headshots are not easy to do. Even people who are trained to use guns could find making headshots very hard.
Fourth, there's also good old human panic that could make the situation worse. Denial, mass hysteria, etc. could potentially get a lot of people killed. It only takes one infected after all to infect a group of people.
I could be wrong but I don't think zombies brain actually function; well, at least they don't function like human brians since zombies don't need most life functions anymore.