One and Only Is Your Tactic

You pillaged the foster
You savaged the foster
You burned the forest down
You built a fence around you
To keep the wild out
And then repeat
And repeat again
And again repeat
And again and again and again
Taller the fence
Thicker the fence
Longer the fence
Each time taller
Each time thicker
Each time longer
To keep the wild out
Your one and only tactic...