Polkadot Bridges

I have some question regarding to polkadot bridges. It make sense to trust Bitcoin and Ethereum (the two strongest chain) and bridging them to Polkadot. But, how about other least- secured chains? How polkadot guarantee the safety of the network if bridging with least-secured chains? Thanks.

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I don’t think the blockchains on either side of the bridge share security mechanisms. So let’s say there was a bridge to ETC and it had (another) 51% attack, there would be no security consequence for DOT or the other parachains.

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