Indians are cheap and many in job roles are not qualified or care about their job.

Do you think the business generates enough surplus to be able to afford the safety margins & additional expenses you’re talking about?

If I were on the job, as an engineer, I would make sure that the ropes and slings are atleast 100% more than calculated values.

Let’s pause and reflect for a minute — why is it that you (or someone similarly qualified) are not employed designing stage rigs, and instead doing whatever it is that you do? Chances are the answer comes down to economic productivity (and lack thereof).