Sarah Hromack of Forward Retreat has a post about museum security - itself a response to Tyler Green's investigation of a damaged Truitt. They both talk about security guards and how much responsibility for damage should be placed on them.
Here in Richmond at the Virginia Museum of Fine Arts, and I assume most other museums, guards (and janitors) are outsourced, and are not museum employees. They take a two-day class, make $7.35 an hour, get no benefits, and often work one or two other jobs. It's another case of the richest hiring the poorest and paying the least - you get what you pay for.
Damage to artwork is a shame, but the exploited poor bear no responsibility whatsoever.