Answer:
Their intentions were different.
Explanation:
Whereas the Spanish came with clear intentions to conquer the territory and take over Native Americans' lands, the French and the Italian sent their explorers with other purposes. Of course, they also wanted new territories, but they didn't try to take them by force.
Instead, they brought a lot of things to trade with the Natives, and were ready to negotiate, which is why Cartier and Verrazano were received differently.
The moral approach to pesticides and anything that destructive happens with so much ease. Carson sees so much that is wrong with pesticide usage in scientific terms. It is a condition that does so much damage to so many living organisms, both animals and humans. The moral dilemma that Carson sees is that the use of pesticides is a simple approach to a complex problem. Rather than people engaging in complex solutions to the problem that embraces biological intricacy, there is an ease to use "shortcuts" that fails to understand ecological context and long-term consequences.