Installing nets isn't necessarily a terrible thing. Suicide is often impulsive and so suicide prevention often features mechanisms to reduce access to methods of suicide. Installing nets is one example.
Of course, once you've retrieved someone from a net you need to give them access to other interventions and I'm guessing these are missing for Foxconn workers. Sadly, they're also missing for a bunch of people in different countries.
At the same time, when people commit suicide at their workplace, it's often a message. If the suicide rate at the workplace is high enough that you need to install safety nets, it may be viable as an emergency measure, but it's a symptom of what should be considered a complete failure of management. Of course, if you consider your employees as cogs in the machine, it's only expected. Once you squeeze an orange sufficiently, no more juice comes out and you can discard its remains.
Of course, once you've retrieved someone from a net you need to give them access to other interventions and I'm guessing these are missing for Foxconn workers. Sadly, they're also missing for a bunch of people in different countries.