Here for example is the AP: "Youngblut got out and opened fire on Maland and other officers without warning, the FBI said. Bauckholt tried to draw a gun but was shot, according to the affidavit. At least one border agent fired on Youngblut and Bauckholt, but authorities haven’t specified whose bullets hit whom."
https://apnews.com/article/vermont-border-patrol-shooting-wh...
Have you seen any later reporting that contradicts this?
e.g. the decision makers could be incompetent, they might not care that much, they had some other contradicting information not publicly revealed, etc…
In the case of David Maland, the chance of it being a completely normal "traffic stop" by a federal border patrol agent (who's job is not to fill the counties chest by writing tickets, as you incorrectly state), completely unrelated to these people being under surveillance at the time for being armed and in tactical gear, is dubious to put it mildly.
They didn't even tell the guy to expect a violent reaction. Of course they didn't, because if they had he would have rightly refused.