Our new kitten... maybe

Here's Jazzy with our kitty. I haven't decided if we are going to keep her or not. What I would like to do is spay her at 8 weeks, along with her little sister, and just release her back outside. I wasn't prepared time wise and financially for a new addition. We'll see what happens. I'd also like to trap all of the other cats outside and spay and neuter them so that this doesn't keep happening. One of my big pet peeves is letting animals breed indiscriminately. I am all for a mandatory spay and neuter law and heavy fines for people who don't follow it. Of course, the usual excuse I've heard for 25 years is.... "It's not my cat/dog, so it's not my responsibility".