I know that this is a sensitive topic, too.
If one runs WordPress mostly as a platform for Event Calendar, then uninstalling the event calendar is probably the worst nightmare that could happen. Comment spam would probably not be a major issue.
Obviously, privacy issues and crime are serious problems, that need to be taken into consideration. So there is a fine line... How much risk is one willing to take and what are the alternative safeguards.
I just wanted to post a note and tell that sometimes people do "stupid things" as they are not willing to really accept the alternative either. I have done it, as the cost in time/money would have been to great, and it doesn't make me proud :(