The parent comment isn't celebrating his death. They did however cut off the quote, so I will render it in full here:

  "I think it’s worth to have a cost of, unfortunately, some gun deaths every single year so that we can have the second amendment to protect our other God-given rights. That is a prudent deal. It is rational."

The legacy Kirk leaves behind isn't incorrect or worth discarding; some violence is a part of any collective society. But at what point does the deal stop being prudent? How many politicians, schoolkids and religious groups have to be shot up before we reassess our laws? If we never stop, then the cycle is always waiting to start up again. The tinderbox can be lit for any reason, and give any administration just cause for martial law and "emergency powers" abuse.