Do you know the brand/model of the jump pack that caught fire?
The lithium polymer batteries used in these have extremely high energy densities and require respect. However, with careful engineering these can be safe. There are literally billions of these in cell phones, laptops etc, and while fires are not unheard off, they are uncommon.
I do worry about the flood of very cheap and likely poorly engineered jump packs, phone power banks, and camping battery packs that are selling like hotcakes. I trust Apple, Dell and the like to engineer their products for safety, but who knows about the uber cheap box of battery type devices.