You could have saved the lives of thousands if not millions of insects by not living the lifestyle you chose. How many insects have died in the creation of your house and your car not to mention your possessions. You could have avoided these by choosing to live in a tent and a very minimalistic lifestyle but you didn't you chose a life of luxury and easy living at the expense of thousands of helpless animals. Why is it ok to slaughter these animals for your benefit but the OP can not kill this spider for his benefit.