Lithium Ion Polymer (LiPo) cells have a very high energy density ... a lot of power stored in a small space. So if abused they certainly can produce fireworks. However the safety circuits built into all commercial applications are pretty fail-safe and will prevent problems 99.99999% of the time.
Remember there literally are millions of LiPo packs being charged and discharged every day - virtually all mobile phones have them for a start. Percentage-wise the number of incidents is absolutely tiny.
I fly r/c planes for a hobby, and LiPos have revolutionised electric power to the extent that I've totally switched from IC engines to electric now. But this is much more risky than using LiPos in cellphones/laptops/etc., which are only ever charged with a matched and dedicated charger.
The packs I use vary in capacity and cell count, and a single charger is used for all of them - which must be manually set to the correct voltage (cell count) and current. Make a mistake (that the charger's software doesn't catch for you
) and a fire WILL result. Cells can also be physically damaged (e.g. in a crash), and over time the individual cells within a pack can get out of balance. None of these risks apply to a sealed 'plug and play' setup like a laptop, unless of course there's a design/build flaw.
People forget that 'old technology' batteries like NiCd and NiMh had some risks too. Although the electrolyte in them wasn't flammable, the rigid metal cases could burst explosively if over-charged (I have seen this happen).