Based on the facts, safety measures at construction sites are generally pretty solid. It's unlikely something like a crane operator falling to his death would happen.
Frank was a full-time employee, and he had a proper safety contract. Honestly, the actual trouble caused by his fall wasn't as big as the media storm that followed.
If his death wasn't an accident, and someone used it to put pressure on the construction site, it would be a pretty effective tactic.
After all, there's already been a precedent. Ryan got framed because of something like this.
If you look at it more closely, the whole thing feels off.
Cranes are tall, and if you don't follow the rules, they can be dangerous. That's why every time a worker climbs up, they're required to secure their safety harness. Plus, there are cameras at the top of the crane that monitor everything, so you can see exactly what the worker is doing.