Kids break stuff. It’s sort of natural. You should encourage it.
Don’t make kids afraid to break things. You should teach them healthy respect and not wanton destruction, of course. But they shouldn’t be afraid to touch things and experiment and even take them apart.
How else will they learn how to put them together? Most sense of the physics of the world comes intuitively, though contact and experimentation. You can’t ever understand how a hammer feels, predict the arc of the swing in your hand, if you’ve never done it. Reading about hammers, watching videos about hammers – it’s not enough. You’ve got to swing one.
And for kids, sometimes that means swinging them onto little toy cars in the driveway. It’s okay.