One could view it as an accidental death. The mosquito didn't intend to transmit malaria, or to kill the child, it was just a side effect of what it does every day. Though, mosquitoes being parasitic by nature, they aren't very respectful of human right to property (they steal people's blood for a living, after all). Maybe more like an alcoholic who drives drunk.
Anyway, I like your analogy as an answer to the mosquito vs. malaria blame game, but it may be impossible to directly compare a mosquito-inflicted death to one caused by a human in any fashion.
In short, blame is irrelevant...human rights trump mosquito (or malaria) rights, IMNSHO, so if we could somehow destroy mosquitoes (and/or malaria) entirely in the sub-Saharan region, that'd be entirely alright with me, to hell with the consequences (some argue it would impact other wildlife, as mosquitoes are a food source for birds, as well as a pollinator for some plants, and those birds and plants are a food source for bigger animals, etc.).
