Your target is long gone by the time you can detect short wavelength visible spectrum. Jets don’t need to get physical with you to do damage, it’s not WW2 anymore. That’s not to say countermeasures aren’t a focal point of research.

There are lots of “smart people” out there shitting on very serious work after reading some tweets from captain obvious. There are lots of even smarter people who don’t think everyone else’s an idiot and therefore think long and hard before shitting on work they don’t understand.