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CRT sets aren't particularly dangerous to open either as long as they are unplugged. The CRT can implode if struck with significant force but that's about the worst that can happen. A lot of people hear that there is high voltage on a CRT but it is low charge/low current high voltage...the charge stored in the high voltage system of powered off TV is approximately the same as that you get from shuffling your feet on carpet and touching a doorknob (the static shock case sometimes has higher voltage). I've been bit by CRT HV countless times and am still here to tell about it. Most sets since solid state electronics came along don't store CRT HV charge for more than 1 minute after power off...there are ways of safely discharging the older sets too.
The thing you never want your kid working on is microwave ovens. The power transformers in them are high current (it's current that kills) and high voltage and are alternating current which is harder to let go of and disrupts muscle control including the heart...the tubes in some microwaves are filled with poisonous gas too.
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