There’s a fundamental pyschology concept called “Bystander Effect“, where a group of people are less likely to help someone in need than when a single person is present.  Everyone in the group thinks someone else will/should help the victim, instead of them.

Think about this when you send an email — I recommend you clearly articulate who you want to do what, and ideally only put 1 person in the To: line of the email (even if you have a few people in the CC: line).