An old saying enunciated: “Haste is bad counselor”
A lot of time, in the producing departments, the operators try to elude the safety devices in order to make the process faster at the maximum.
During the study of a safety device (and the safeguards are part of this category) it is always necessary to consider the tendency of the operators to exclude each possible breaking of their work, also if it is made to protect their safety.
The Machine Directive is so much specific on this point and it makes reference to the study of the safety devices in a way that the operators cannot bypass them in a so simple way: this is the concept of ineludibility. In this video You can find some important info about this argument.