As mentioned elsewhere in this story and thread:
Landmines are autonomous, durable, and persistent. Very dangerous. And easily forgotten by their employers.
Claymore mines ditto, though less appreciated for their durability, and found so much more quickly.
Technology has produced much more interesting autonomous weapons, mobile, with greater range, but if you're all worked up because they are being controlled by operators half a world way that high-five each other when they obliterate a wedding party, well, you've missed the old white men and women in a room full of screens showing blobs moving and some going cold...
And before that, old white men in subway tunnels moving little wooden icons around a map, listening to telephone reports, and lighting up a cigar to celebrate that they have, once more, survived the night.
War is more and more fought elsewhere. This may be offensive to your delicate sensibilities, but be thankful you are not shooting from your bathroom window. Or not. Just don't ask me to pretend you have any moral high ground. We must change things or accept the world as it becomes.