Google isn’t going to block search results or websites, they’re simply not going to place paid ads for guns or gun related items.
It's a slippery slope. I don't give a 'Rats ass if they don't carry ads for dangerous products. By and large, I don't care about ads, anyway, unless I'm actively shopping at the time.
But how long until their do-gooder-ness extends to search results? That's the point at which they become worthless to me!