<RSBM>
If you're looking for ways to demonize Daniel Penny regarding his Samson tattoo & use Christian Scripture to justify it, you're going to find exactly what you're looking for. It's pretty easy to take it out of context, actually. If you've ever studied Biblical theology, especially OT (Old Testament) theology, it's even easier.
You could really go a couple of different ways with this. One, like you did, and the other, which conjures up considerations of humility in the face of chaos and trusting in God even when things look or feel impossible, the way Samson trusted God to give him the strength and the ability to defend Israel against it's enemies.
On the other hand, if you don't know Penny, his life, his views on the Scriptures, or what that art from Charles Brock (the depiction of Samuel killing the lion with his bare hands) actually means to him, it's all 100% speculation and most probably inaccurate.
Truth is, Penny might not even be a Christian (I don't know if it's been mentioned at all), and he may know absolutely nothing about who Samson was and what his role was in fighting off the Philistines to defend Israel. He might have just seen the image (maybe some other guy in the service had one) and thought it looked pretty cool, and got the tattoo.
Unless DP himself comes along and tells us, we're never going to know.
jmo