This may be because non-emigrants are only abroad for a short time, and are focused on their short-term objectives (like studying). Emigrants, on the other hand, have settled lives, and so they feel a greater desire to participate in politics.
這顯示非移民在國外只是暫時性的，把出國的目標（如讀書）完成才是正務；移民已經安家落戶，參與政治的需求再度抬頭。