Those who elect politicians are citizens so they're the ones who hold the responsibility to choose wisely.
ご質問ありがとうございます。
・「Those who elect politicians are citizens so they're the ones who hold the responsibility to choose wisely. 」
（意味)[政治家](https://eikaiwa.dmm.com/uknow/questions/34396/)を選ぶのは国民なのであくまでも国民が慎重に選ぶ責任がある
・politicians「政治家」
・citizens「国民」
・responsibility「責任」
参考になれば幸いです。
Those who elect politicians are the ones to blame because they chose those politicians in the first place.
Citizens elect their politicians, so they are the ones to blame when the politicians don't do what they are supposed to do.
Those who ... から始められなくはないですが、あまり自然な言い方ではありません。
ーThose who elect politicians are the ones to blame because they chose those politicians in the first place.
「最初に政治家を選ぶのは彼らなので、政治家を選ぶ彼らに責任がある」
次のように言う方が自然です。
ーCitizens elect their politicians, so they are the ones to blame when the politicians don't do what they are supposed to do.
「国民が政治家を選ぶので、政治家がすべきことをしないならそれは国民の責任である」
ご参考まで！
アメリカ合衆国 
カナダ 
