5-year-old shoots his 2-year-old sister

Your post baffles me more.
That post should be interpreted as sarcasm. If you get it then the bolded part of your post isn't only unnecessary but insulting.
And also, what's the problem with joking about it?

Sarcasm? That post is a mile closer to a joke than sarcasm. And even if it was sarcasm what would it be trying to point?

and whats wrong about joking about this? do I seriously need to respond?.

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More on topic: There's something definitely wrong with the regulation of guns if people can buy one for 5 year old kids. I thought you have to go through a whole process before buying one which includes verifiying how many guns you already have and justifiying why you want to buy the gun, I wonder if these checks failed and if I'm wrong and they are not even implemented then that's just plain stupid. Those of you that are against gun regulation, if those 2 points are something you're against too then you people have a problem.