Janeway was entirely within her rights to do what she did. She took the best possible way out of the situation.
While it was certainly a worthwhile goal to erect the memorial in the first place, the fact remains: the integrity of the mind is an ABSOLUTE right.
The makers of the memorial had no right to force their memories into others without consent. I don't care what the memorial was for - mind rape is not the way to go about it. That is in itself an attack upon Voyager
's crew, and Janeway had the right to defend them from it.
Now that the memorial is fully repaired, and there is a warning of its existence
, other crews will not be assaulted in the same fashion, and the memorial will still fulfill its purpose.