为什么在我激活工作表时代码会起作用，而在不激活工作表时却不能起作用？

Question

如下所示，如果我添加ws.Activate，此代码运行得很好，但如果不这样做，它将陷入ws.unprotect周围的无限循环中。这是为什么？有什么方法可以使此代码运行而不必激活每张工作表吗？

Sub passwordbreaker()
    Dim ws As Worksheet
    For Each ws In ActiveWorkbook.Worksheets
        If ws.Visible = True Then

ws.Activate

            Dim I As Integer, j As Integer, k As Integer
            Dim l As Integer, m As Integer, n As Integer
            Dim i1 As Integer, i2 As Integer, i3 As Integer
            Dim i4 As Integer, i5 As Integer, i6 As Integer
            On Error Resume Next
            For I = 65 To 66: For j = 65 To 66: For k = 65 To 66
            For l = 65 To 66: For m = 65 To 66: For i1 = 65 To 66
            For i2 = 65 To 66: For i3 = 65 To 66: For i4 = 65 To 66
            For i5 = 65 To 66: For i6 = 65 To 66: For n = 32 To 126
            ws.Unprotect Chr(I) & Chr(j) & Chr(k) & _
                Chr(l) & Chr(m) & Chr(i1) & Chr(i2) & Chr(i3) & _
                Chr(i4) & Chr(i5) & Chr(i6) & Chr(n)
            If ws.ProtectContents = False Then
                 GoTo nextsht
            End If
            Next: Next: Next: Next: Next: Next
            Next: Next: Next: Next: Next: Next
        End If
nextsht:
    Next ws
End Sub