Charles guiteau most likely assassinated president garfield because
he was against garfield’s reforms.
he wanted grant to become president.
he wanted hayes to become president.
he did not like the job that garfield gave him.

the most likely reason why charles guiteau assassinated president garfield is that he did not like the job that garfield gave him. guiteau was mentally ill. he was a loyal republican and gave some speeches in favor of garfield. when garfield took office he went to washington to collect his reward. he wanted a paris or viena consulship, which he didn't obtain because he was unqualified for the job.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.