In chapters 7-8, qhat condition were Dally and Johnny in?

Pony says that Dally would eventually be okay, "one arm was badly burned and would be scarred for the rest of his life, but we would have full use of it in a couple of week". Johnny, however, had third degree burns over most of his body and his back was broken: he was not expected to survive,

Why did darry never lock the front door to the house and what does this say about the greasers