The Gun-control "movement"

I say "movement" because it is a popular attitude shared by many. It tends to be more Democrats than Republicans but not exclusively.

There seems to be a split in thinking by some that favor removing certain firearms from civilians. I understand the folks who think that civilians and most of law enforcement should be disarmed of their guns. I disagree but I understand.

This question is for those that believe in disarming civilians and leaving firearms in the hands of the police.
I infer that the principle reason for this is that the police would use that weapon in performing their duties.

Should it be among the duties of a police officer to defend his/her own life while endangering the life of another?