Killing spiders in your home is wrong but understandable , because that is like breaking and entering on the spiders end.
But people who walk outside and kill spiders for essentially no reason, should be fined or do some time in jail. You are not just ruining the spider's life, but you are damaging Mother Earth by removing her natural insecticides.
And every time you kill a spider you're actually preventing hundreds of spiders from existing because they give birth to hundreds , and you are preventing those from existing and helping our planet. So you are causing hundreds if not thousands more flies, mosquitoes, cockroaches, or other pests to be nuisances, just by killing a single spider. Knock it off!