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Don't worry. The robots can use machine guns like the rest of us.

Unfortunately, you don't need that much power to permanently blind a human.

for that matter; microwaves cook us from the inside out at 100+ meters, and don't require very good aim.

Bill Gates was already involved in a startup to radar identify and kill mosquitos with lasers . . . guess it did not go well.

It resulted in a prototype that apparently cost $50 per unit, but no retail product yet.

Are there massive amounts of retail products in, say, Africa?

Yes, Africa's retail market was worth US$1.4tn in 2015.[1]