ZD, hindsight is 20/20. Thousands of people leave their talis and tefillin in cubbies in shuls all the time. There was the occasional theft (although a miniscule percentage), which is why, I’m sure, there are cameras, but this is an even more rare occurrence.
YWN reported: “In that shul close to 2000 people daven and learn there each day. The Tefillin were placed securely in a cubby outside the Beis Midrash.”
It is wrong for you to insist on laying blame.