Question: How is Scarlet Spider still alive if he was in the crashing Hydra island?
Question: Scarlet Spider says 'the last time I had a family, I almost destroyed them. Won't be making that mistake again' but how could he destroy them again? Also, why didn't he come back to S.H.I.E.L.D.?
Chosen answer: Scarlet Spider considers Spider-Man and the team his new family and he won't make the same mistake of getting his new family almost destroyed. He wasn't talking about his last family. SPOILER ALERT: After it is revealed Scarlet Spider worked for Doc Ock as a spy and he unmasks Spider-Man, he goes into hiding. He also attempts to figure out the truth of his origin, which he can't do very well while working for S.H.I.E.L.D., or if they lock him up. However, at the end of Season 4, Scarlet Spider does come back and becomes a S.H.I.E.L.D. Academy teacher.
Chosen answer: He simply survived the crash without much explanation of exactly how. However, he hid from everyone after the crash to find out his truth, so everyone just thought he died. (This is common is comics where someone is presumed dead or in a situation "no one could survive" and then later shows up alive and the how isn't explained).