I don't think that you know what the Government actually knew before stuff occurred. The USA intelligence community knew about the attack on Pearl Harbor before it actually happened. The USA intelligence community knew about the 9/11 attackers and a pending attack before it ever occurred. The government knew about the Orlando shooter before he ever fired his first shot.
Don't assume that because a politician failed to act on something that the intelligence community didn't know that it was going to occur. I have rarely ever read about or so the autopsy on some terrorist act that occurred on USA soil or in any part of the World; that the USA intelligence community didn't first know about in advance. Doing something proactively about it before it occurs is a different story, but knowing about it is something that they almost always are aware of.
If the government knew things were going to happen they could stop things before they were executed, they do not and they regularly fail to do so. So if we are to believe your initial contention that they know before everyone else, we have to accept that they either don't know what you claim or they do know but allow it to happen.
Funny you bring up Pearl Harbor, there are a great deal of people like myself who believe the US knew and allowed it to happen to generate public support for the US entering the war. That said its obvious that if they knew why did they not act?
US knew about 9/11 yet didn't stop the attack, didn't act on anything the flight instructors told them about the hijackers, knew the hijackers names and where they were yet did nothing to stop them? why is that.
You claim the government knew about orlando shooter, but that isn't true, the FBI claim they cleared the man from being a terrorist.
Intelligence community claimed the soviet union was as strong as ever, until it collapsed. The US intelligence community is a joke, you just saw a report of a failed raid due to poor intelligence and not knowing the difference between a terrorist outpost and a terrorist headquarters. We can go on about the times the US intelliigence claimed it killed the #2 of Al queda 3 times, how they claimed OBL was in the mountain of afghanistan, when he was supposedly in Pakistan the whole time, when it claimed there was WMDs in Iraq, and I can go on.
Fact is, US intelligence reports can be shared with states and the FBI can act if a potential threat appears in a state and has violated federal law.
shyt isn't hard