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With the Holland and Holland pattern, I can't understand how they work, unless it is simply that the two parallel sears are far less likely to fall out of notch in tumbler, compared to only one sear possibly falling out, because the ones I have seen have no means to prevent the double sears from falling out of notch, bent---they are made same as single sear gun, but have the double parallel sears.

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I'm no expert, but to the best of my knowledge, the Holland sidelock intercepting sear is totally different to what you describe.
The Holland sidelock features a totally seperate system for the intercepting sear.
If you examine a Holland sidelock, (and many other quality sidelocks) you'll see that as the trigger is pulled to fire the gun, the trigger is actually raising TWO sear levers, not just one.
The trigger lifts both an intercepting sear AND a tumbler sear at the same time.

If on the other hand the tumbler sear was accidently jarred free, without the trigger being pulled, the intercepting sear has not been lifted clear and will catch and hold the tumbler, preventing it from reaching the striker.

On some systems it might be possible for the tumbler sear and the intercepting sear to both be jarred free from a hard knock, and still allow the gun to fire.

This would normally not happen though, as usually the depth of the engagement of the intercepting sear is FAR greater than the tumbler sear, meaning it would take a far far bigger jolt to jar it enough to prevent it's task of catching the tumbler.

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