Of course you can just say 'can' , but you should have learned by now that languages have many ways of saying things, many habitual phrases, and many pseudo-synonyms, and that native speakers make use of them to add communicative value to the standard textbook sentences that learners too often study. 'Always' here is an intensifier for the possibility that is being suggested. It is often used as a note of encouragement or consolation for the person spoken to.
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