I really need your help to check these sentences and alternatives. Thank you very much!

1) According to Rousseau's theories,society was regarded (better: should be regarded) as the source of any kind of evil and corruptions.
2)One of the main themes is that of colonialism, which according to Conrad is the product of human lust for power (better: the result of ?)
3) One of the main themes he dealt with in his novel regarded (?) the task of the poet.
4) According to the Romantics, man had to live detached from civilization, which had brought any type of evil to mankind.
5) They looked at the child as the ideal person, as he was unspoiled by the rules of civilization. His personality was unrestrained, good and free to express itself.
6) That's why they exalted men who lived in the countryside, because they had not to deal (didn't have to?) with the darkness of society
7) A pantheistic view of nature is present in the poem. Nature is presented according to a pantheistic view?
8)Colonialism led black people in slavery (correction: enslave black people).
9) Because Europe is associated with colonisation and exploitation of the natives, "white" turns into evil, while "black", that stands for the natives, becomes good.

1. corruption (singular)

6. didn't have to = seems better

8. enslaved (past tense)

8. natives, and becomes good.

Sra