You believe altering shells is dangerous. Fine. Don't do it.
I, on the other hand, enjoy testing such alterations, to learn what the dangers might be. If I find a danger, I will know there is a danger, rather than just believe there is a danger. I prefer knowing over believing.
Your picture demonstrates that a barrel obstruction near the muzzle will sometimes cause the barrel to burst. When I see that picture, I think to myself "make sure the barrel is clear before shooting - and especially after stumbling or tripping while in the field."
I also think (thought) "I wonder why we don't see many burst barrels near the chamber?" and proceeded to run tests with barrel obstructions near the chamber, and then progressively further down the barrel.
I know know (as opposed to believe) that the risk of a burst is much greater when the obstruction is more than half way down the barrel. Closer than that, the damage is often a bulge or ring as opposed to a burst.
The last gun I blew up was a 12 ga Cooey single shot. It did not blow on the first 3 attempts. Finally, we stuck a big lag bolt in the muzzle and then pinched barrel flat in a vice. Even then, the damage was not significant. We can cut 6" off the barrel and put the gun back into service.
If you prefer to recognize danger and stay away, good for you. A reasonable attitude.
I don't believe anything I have ever done has been any more dangerous that the usual vagaries of loading and shooting.