Certainly not - my original reply-post indicates that I feel the cats
are only doing what cats do, and are not to blame.

However, there are ways of preventing cats from roaming - the enclosed
cat-run mentioned by Rod Out Back is one. Unfortunately, very expensive.

M

Or you could just keep the cat inside....I have an ex-feral who it can be
difficult to keep inside, but we (mostly) manage it. It's safer for the cat,
spares the family from losing a much loved pet, and above all- cats are NOT
part of the Australian ecology!!