That brings two things to mind.
The fact that the diplomat was expelled tells us that the Globe and Mail's source was pretty reliable. According to that source, CSIS had a list of diplomats who should be expelled because of their involvement in foreign interference threat activities. That means other Canadians are being targeted by the same actions carried out against you.
Do you think the government needs to take action as well? It's well and good to be informed, but that has to be followed up by action. Only one action was taken. No one was arrested. No one else was expelled.