system
Given the following post, respond as if you're commenting on Reddit:
human
[Raimi Spider-Man] In Spider-Man 3, why couldn’t/wouldn’t the Venom symbiote immediately attach itself to Peter Parker the way it did to Eddie Brock?

Something that confuses me is why the symbiote wouldn’t just merge with Peter the moment it touched him. Why was it necessary for the symbiote to disguise itself as a costume for a time before it actually tried merging in the church bell tower? That was only when it’s life was threatened, too. Why did it bother going the extra step of making itself be a removable costume when it had the power to fuse itself into him like it did to Eddie Brock?
gpt
When the symbiote first came to earth it was weakened and vulnerable. It didn't know what the abilities or capabilities of the native population were. If it reveals itself too soon then it might be destroyed, so instead it was subtle and tried to secure itself through mental control. It also had very different morals to Peter, and Peter would have fought the symbiote immediately if he knew what it was. Even once bonded with Peter, it's unlikely that a forceful bonding would be as straightforward as with Eddie due to Peter's enhanced physiology. Once Peter figured out the symbiote's nature, it was under pressure to find a new host and fast. It also knew that humans were weak and vulnerable so went all in on the first one it found, who just so happened to have incredibly compatible motivations, making the bonding even more complete.