In the USA, the landlord holds the bulk of the responsibility if shoddy electrical work injures or kills someone. While it is certainly possible for an amateur

In the USA, the landlord holds the bulk of the responsibility if shoddy electrical work injures or kills someone. While it is certainly possible for an amateur to follow the right procedures and do safe work, it's also possible (and even quite likely) that they don't know everything they need to do, and end up doing something unsafe. While you can easily destroy a house with a cigarette (though many landlords have non-smoking clauses here), a cigarette won't generally burn down the house a year from now after the tenant who did the work is long gone.