Too soon?

Pure speculation here, but my secret to getting the best protection from my own bodyguards is that I'm pretty rarely an asshole to people who work for me.

Also, I don't have very many bodyguards. Because I'm not important. So my experience may not be relevant.

"don't be a dick" -- wil w
It's wisdom for everyone.
My wild-ass guess here is that some filtering effect is in play. Secret service people that can perform at that level, with a clean enough background, can absolutely move on to a better (and less lethal) job if they want¹. This is a position where "will you take a bullet for this president?" is absolutely front-and-center for the interview process. Also, it doesn't take a brainiac to see that this President has a tendency to attract violence, which is not ideal for anyone with that security detail. So, trump got the best security he could possibly get which, due to his repugnant personality, are probably not the best in the business.
¹ "Our new company head of security is former Secret Service, can you believe it?"

I don’t get it, I assume it has something to do with the Trump assassination attempt. Did the secret service not look up a slope or something?

They apparently decided not to secure the roof that the assassin ended up shooting from because it was sloped and so they were afraid.
I'm not making that up.
"That building in particular has a sloped roof, at its highest point. And so, there's a safety factor that would be considered there that we wouldn't want to put somebody up on a sloped roof. And so, the decision was made to secure the building, from inside," [U.S. Secret Service Director Kimberly Cheatle] said.
She's also trying to throw the local cops under the bus.
"In this particular instance, we did share support for that particular site and that the Secret Service was responsible for the inner perimeter," Cheatle said. "And then we sought assistance from our local counterparts for the outer perimeter. There was local police in that building -- there was local police in the area that were responsible for the outer perimeter of the building."
- Idk that saying "they didn't do their jobs" when they didn't do their jobs is really throwing them under the bus. SS counts on local law enforcement to do things, it's just a fact.
  Ignoring that one of their snipers saw him pull out a rangefinder though...
- Wow. That’s… I don’t even know. Funny? Sad? Ridiculous? Maybe all of the above.
- That building in particular has a sloped roof, at its highest point. And so, there's a safety factor that would be considered there that we wouldn't want to put somebody up on a sloped roof.
  Uhh what the hell, the snipers that took the dude out were on a sloped roof behind the stage? Do they have a one sloped roof per venue rule?
- Falling off a roof is a very real danger, to be fair to the US-SS.
- Forget the building. I want to know how the shooter even got close with a gun? I would not be shocked that Trump refused to allow metal detectors at the entrances.
The shooter was on a roof

Are we all sure the SS was putting in 110% that day?

I get it - they're pros - but hear me out : Trump.

The WHAT??
For real: is that how the secret service really is abbreviated? Talk about a Freudian slip...
(And I know that the secret service is older... I think)
- Usually people use USSS for this reason
- The secret service was established by the Department of the Treasury 159 years ago under the Abraham Lincoln to suppress the counterfeiting of currency, which is still their primary mission
- No, it's USSS. For exactly that reason.
They probably just had a use of force policy that required approval from above to use deadly force before anyone had shot.
- They do, because 99% of the time “that person right there!” is someone trying to take a picture of the president.