Oh, I think we could leave it to prison authorities to keep him safe, just like we do for other convicted criminals. This is a 100% fake conundrum.
If Trump is convicted, Secret Service protection may be obstacle to imprisonment https://www.washingtonpost.com/dc-md-va/2023/08/04/trump-criminal-cases-prison-secret-service/
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Secret service for life is by statute:
https://www.archives.gov/about/laws/former-presidents.html
I didn't research whether retroactively changing this statute would violate the ex post facto prohibition, but my gut tells me that it would. It's not a criminal statute, but change the consequences for behavior.
But I didn't do the research, just going from gut.