The Hamato Clan and Shredder are a two opposing ideals.
The strength of the Turtles is through their unity with themselves and the family they have gained through everyone they come to see as honorary family and as friends and allies.
The Shredder on the other hand, sees such ties as weakness and facile. Everyone he allies with is just a tool or a weapon to be discarded once it no longer serves any purpose. And everything that Splinter has said only provides a false sense of power or purpose. Such as vengeance only causing more pain or anger being a false friend in battle.
The Shredder however, is too dangerous to live and the only way to defeat him for good is to end him. And this will be more than just the Hamato Clan defeating him...it will be the Shredder's followers turning against him as well.
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