No one I knew would think to deliberately speak against Jesus or blaspheme intentionally just for sport or being foolishly filled with carnal bravado. In my previous life, leaving the church or not going along with this or that decree of the Magisterium might be construed as "unpardonable" since it was God's True Church one was defying, but I even doubted that because all the scandal, flip flops, questionable proof texting, theories, ideas and goofy personalities didn't seem unpardonable for getting tired of. This would be true of all organized churches.
So.... Rather than post someone's theological view on this topic , of which there are many, Just What Do You Mean Unpardonable Sin? Who do you know committed it? What did they do to commit it? Are the Gospels playing control and fear games with the audience?
Why can't such things, whatever they are just be forgiven and come under the New Testament formula of :
Matthew 11:28-30 “… Come to me, all who labor and are heavy laden, and I will give you rest. Take my yoke upon you, and learn from me, for I am gentle and lowly in heart, and you will find rest for your souls. For my yoke is easy, and my burden is light.”