One problem is that, in a world seing the vanishing of bees and other invertebrates by pesticides, insects are just not so reliable as source of safe food now.
"cruelty" is a false problem, a species of new religion that can accept as perfectly good move to set free a mink from other continent that you know will kill thousands of native birds later. Just a modern fairy tale, that did never prove to solve absolutely nothing. Is just manipulation.
If there is a market for bugs something will end selling ilegally wild bugs (cheaper, better profit margins). This is what history tells us again and again.
I really hope that we as species can be more smarter in the future about this. Famines are not caused by people not eating bugs, are caused by people creating wars by design, etc...
You eat farmed insects which are clean and you can be sure they're free of pesticides or other agrichemicals.
Farming insects uses less land and water than farming meat and is less problematic regarding cruelty.