The craziness of the current bomber is as relevant to Trump's policies as the craziness of the Unabomber is to environmentalism.
He hasn't directly told people to send pipe bombs to those who criticize him. That is true. Trump has made his views condoning violence pretty clear though:
Encouraging violence against reporters:"Any guy who can do a body slam, he is my type!" - referencing Greg Gianforte after his attack on a reporter
Encouraging violence against protesters:"If you see somebody getting ready to throw a tomato, knock the crap out of them, would you? Seriously, OK? Just knock the hell ... I promise you I will pay for the legal fees. I promise, I promise," - talking to crowds at a rally in Cedar Rapids, Iowa.
"I'd like to punch him in the face, I'll tell you." - Talking about a protester who was being removed from a rally in Las Vegas.
"Get him out. Try not to hurt him. But if you do, I'll defend you in court. Don't worry about it." - Talking about a protester at a rally in Warren, Michigan.
Encouraging violence by police officers:"When you see these thugs being thrown into the back of a paddy wagon, you just seen them thrown in, rough. I said, 'Please don’t be too nice,'"
"When you guys put somebody in the car and you’re protecting their head you know, the way you put their hand over [their head]. "Like, 'Don’t hit their head and they’ve just killed somebody, don’t hit their head.' I said, 'You can take the hand away, OK?'
Comments Trump has made on the people the bombs were sent to:
The media in general:
"The FAKE NEWS media is not my enemy. It is the enemy of the American people.” - via twitter
George Soros:
“The very rude elevator screamers are paid professionals only looking to make Senators look bad. Don’t fall for it! Also, look at all of the professionally made identical signs. Paid for by Soros and others. These are not signs made in the basement from love! #Troublemakers.” - via twitter about Kavenaugh's confirmation protests
Obama:
"Terrible! Just found out that Obama had my "wires tapped" in Trump Tower just before the victory. Nothing found. This is McCarthyism!"
"Is it legal for a sitting President to be "wire tapping" a race for president prior to an election? Turned down by court earlier. A NEW LOW!"
"How low has President Obama gone to tapp my phones during the very sacred election process. This is Nixon/Watergate. Bad (or sick) guy!"
Hillary Clinton:
“I think that her bodyguards should drop all weapons. I think they should disarm. Immediately. Let’s see what happens to her. Take their guns away, O.K. It’ll be very dangerous.”
Eric Holder:
"Holder is — he's got some problems."
Maxine Waters:
"Congresswoman Maxine Waters, an extraordinarily low IQ person, has become, together with Nancy Pelosi, the Face of the Democrat Party. She has just called for harm to supporters, of which there are many, of the Make America Great Again movement. Be careful what you wish for Max!"
John Brennan:
"loudmouth, partisan, political hack who cannot be trusted with the secrets of our country."
Joe Biden:
"Crazy Joe Biden is trying to act like a tough guy. Actually, he is weak, both mentally and physically, and yet he threatens me, for the second time, with physical assault. He doesn't know me, but he would go down fast and hard, crying all the way. "
De Niro:
"Robert De Niro, a very Low IQ individual, has received to (sic) many shots to the head by real boxers in movies. I watched him last night and truly believe he may be 'punch-drunk.' I guess he doesn't realize the economy is the best it's ever been with employment being at an all time high, and many companies pouring back into our country. Wake up Punchy!"
James Clapper:
"New Bombshell in the Obama Spying Scandal. Did other Agencies SPY on Trump Campaign?” Even Clapper, worlds dumbest former Intelligence Head, who has the problem of lying a lot, used the word SPY when describing the illegal activities!"
Cory Booker:
"Take a look at Cory Booker. He ran Newark, New Jersey into the ground. He was a horrible mayor. And he made statements that when he was in high school or college, what he was doing – he actually made the statements."
Kamala Harris:
"@SenKamalaHarris why are you supporting the animals of MS-13?"
Tom Steyer:
"Wacky & totally unhinged Tom Steyer, who has been fighting me and my Make America Great Again agenda from beginning, never wins elections!"
I'd argue that the craziness of the current bomber is directly linked to the language that Trump uses.