I'm Not Surprised It Failed On You.

If You're Stabbing Something That You Would For Regular EDC Used - Ex.: Clothing, Cloth, Boxes, Paper, Packaging, Etc, The Knife Isn't Going To Fail On You Because It's Made To Be Used.
If You're Stabbing Wood ... Well That Counts As Abuse And The Knife Is NOT Made To Withstand Ignorant Abuse.
A Knife Is A Tool Made For Our Uses, Whatever That May Be.
It Is NOT Made For Us To Misuse And Abuse, Which Is What You're Doing.
Knives Can Be Used For Almost Anything, But If You're Trying To Stab Hard Things, And Pry Things Open, And Obviously Do Things The Knife Wasn't Meant For It Is Very Likely To Fail On You.
All That Being Said, There Are Some Very Strong Locks Out There, And They May Not Fail With The First Stab, But I Wouldn't Expect The Knife To Last Through A Large Series Of Abusive Usage.
If We Use Knives Like They're Supposed To Be Used, We Don't Really Have To Worry So Much About Them Failing And Us Getting Hurt.