I think you are missing a few things. First of all, I think the security model for sidechains is the same as that of every blockchain
People will say things, like "but with sidechains 51% hashrate can steal your coins!", but as I have repeated many times, this is also true of mainchain btc-tx. is something else? There are substantial opportunity costs as well as a collective action problem when it comes to re-writing the mainchain. Is there anything similar for drivechains? As far as I can tell there is no opportunity cost to casting a malicious vote, no repercussions, and no collective action barrier that needs to be overcome. Unless I'm missing something I wouldn't liken the security of a drivechain to that of the mainchain.
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