People are pissed because spurs FO is smarter than them on BB issues. And they don't ask themselves why everyone didn't try to trade up in the 20s if that was so cheap, easy and worth it... They wanted a move, something, anything for players they never heard of 3 months ago and have 3/4 chances of ending as unproductive or random, rotation guys... That's what GMs are paid for, being smart and not impulsive or caught in the moment, see the larger picture. This isn't the last draft in history of humanity or the only way to bring talent in your team, I mean real, proven talent, not zero NBA game teens.
The best trades are the ones you don't make. Trading and lose assets just for the sake of it, or because ST badly wanted it, had no sens, unless it's a guy you REALLY LOVE... Spurs are in a good situation...