Giving Ukraine the weapons wasn't the problem. Most of those were made to destroy Russian tanks and airplanes and they've done the job quite well with zero American casualties.
it may well be the best investment the U.S. military has made in a long time.
The real issue is the lack of replacement, as well as bureaucracy. Why does it take one month to make a single Patriot missile? why are Lockheed, Raytheon and the likes so slow? why did Biden not commission significant rearmament? Tons of jobs would have been created in factories to make 155mm artillery ammo, air defence missiles, HIMARS missiles and more ATACMS.