Why not use the technology we have?

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Hey guys, today I was sitting my kitchen having a cigarette and I thought about Japan's recent events and all other serious problems we have at the moment. Then I thought of technology, how advanced we are today, so if we're so advanced how come we still have problems? For example I thought of Nanobots, why couldn't they use them to remove cancer tumors? I've also heard that there's a "Laser" that was originally designed & developed by NASA to clean satellite mirrors with great precision. It shoots a single electron. And there's even a Hospital in US that has adapted this piece of technology to remove cancer tumors, etc. The technology might cost a lot to maintain & run, but isn't it worth it if it saves lifes? I think technology should be used if it makes a difference to people's lifes, what do you guys think?