Your own article makes this exact point: > Matthew Shoemaker, a former Defense Intelligence Agency analyst who left the agency in 2021, said that while Signal was used during his time in government, “it was almost exclusively restricted to scheduling purposes,” such as letting their boss know that they’ll be late to work because of personal circumstances. “That’s why Signalgate is all the more staggering — because these senior leaders were doing the exact opposite of what even my most junior intelligence officers knew not to do,” he said.
You're doing bullshit partisan whataboutism. "well the democrats did it first".
This has nothing to do with adding the wrong contacts. It has to do with putting highly-sensitive material into Signal to circumvent the law around records preservation and as a result creating a situation where it's possible to accidentally add the wrong contact and therefore exposing that information to a journalist.