Bottom has to be a member of every type because functions aren't guaranteed to terminate, so there's no really any way around that within the confines of a general purpose programming language.
That admittedly doesn't entail that Haskell ought to have special functions like 'error' that invite the programmer to explicitly introduce bottom values as a mechanism of signaling errors. However, in the real world, executing any function may raise an exceptional condition at any time (e.g. an out of memory error), regardless of programming language.
More info here: https://wiki.haskell.org/Bottom As bottom is the value of a non-terminating computation and a computation of any type may fail to terminate, bottom must inhabit all types. The same goes for 'error'. Although in real world Haskell code (using GHC) you can trap error values if you really want to, so 'error' isn't in fact indistinguishable from non-termination.
“error” is simply bottom. Bottom is an inhabitant of every Haskell type. There’s no straightforward way to just turn it off.