The first shooter was given a prime location, close to the President, a mere hundred yards away. The security was so lax it was pitiful and the shooter fucked it up, grazed the President's ear and shot the people behind him, killing one.
The second shooter was given a prime location, prior knowledge of Trump's location, a location easily accessed because the secret service only secured the immediate location of Trump, The shooter set up defensive screening with ceramic tiles (whether they would have made a difference is arguable), but he gave away his position by sticking a barrel if a rifle through a chain link fence. Spotted thankfully by the secret service on their forward sweep of the area.
So, given all the above, there seems to be at least the suspicion that people are being given knowledge of the President's whereabouts, knowledge of areas that provide a clear shot, motivation to get into position to make the shot and to take the shot when they have the opportunity.
Reading between the lines and looking at the evidence, it's hard to believe these are two random nutjobs.
Possibly the second actual nutjob is a smokescreen for the original planned operation to make it look like random nutjobs are taking pot-shots at Trump.
UPDATE:
The latest shooter appears to have flown from Hawaii to Florida, acquired a rifle that had the serial number filed off and drove to the place the President would be playing golf.
Hmmm......