Do you think orcs are inherently bad? Or that they are the way they are just because of the circumstances and their corrupted culture? Do you think an orc raised in (for example) Rohan and treated as an equal would be a loyal servant of his king and a good horse rider?
According to Tolkien, yes, they had a natural tendency towards evil, same as Elves had a natural disposition towards good and beauty. It's not my opinion, but this could turn into a lenghty philosophical discussion.