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If you don't need some files in your personal account, there should be a way to get rid of them without deleting them from everyone's accounts who is a part of it.
I actually haven't seen this particular problem in a long time, but from the very start it was one of the worst features of Dropbox -- I'd share a bunch of files with colleagues , for example, and some would move things out or decide that it wasn't relevant for them and would DELETE the files for the whole team, without realizing it.
If this is still going on and the would-be deleter is getting NO notification of what they're about to do, that's terrible design, period.