“... To start shooting as they did is a very serious move by the Lebanese army...”

Have they shot at fellow Lebanese or Arabs, that would have been 'welcomed'?

JPOst interviews some members of (America's) Congress/ here

"... “It certainly is going to come up in our conversations in the Congress about the continued support of the Lebanese Army,” he said.
Klein was speaking by phone from Israel, where he happened to be visiting when the incident, which also left two Lebanese soldiers and a journalist dead, took place....
“If in fact it’s factually shown that this was a Lebanese government authorized action, I think a lot of members would be very concerned about continuing to provide military support to Lebanon,” he said. “I certainly would be.”....
“Whenever there’s somebody who receives foreign aid of any kind from the United States who has a conflict with any of our close allies, especially in the Middle East, which is such a volatile region, you absolutely rethink US support,” a congressional staffer with the foreign operations subcommittee said....
“The question is, how high up does it go? Was it premeditated? Are the Lebanese soldiers going to be reprimanded?” he asked.“If soldiers were out of line, that’s one thing. If it comes from the top, that’s another.”
But either way, the committee staffer pointed out that the realities of the Middle East would still likely result in some level of American aid directed to the Lebanese military.
“It doesn’t mean there’s going to be a certain reduction, because unfortunately for that region it’s the lesser of two evils.
We’d much rather work with the army than Hizbullah.”