ALL BATTERIES ARE DANGEROUS

with that said you must adopt and understand the chemistry your dealing with. Its the same as when we were introduced to NiMh for the first time in this hobby when NiCd was the standard. They are similar BUT different.
There is a standard safety protocol for all battery packs and in addition there are rules for each chemistry.
Like I said before human error is the biggest problem not manufacturing defects or some production/design issue in my experience.

The reason for the popularity of LiPo's in our hobby is simply energy density. The amount of power you can extract from a well balanced power set up will out perform just about ANY fuel burning engine. Thats why these have eclipsed NiMh. Just wrap your head around the technology and practice using them safely and all will be fine.