The bombs weren't that heavy. There were six Forever Stamps which is enough to cover 10 ounces of First Class mail. Given this was a pipe bomb it appears to me it was made to achieve it's goal and cause injury or death to one person.
I think the bomb maker had a sincere, but, a rather naive goal. The bombs to citizens such as Robert DeNiro had a chance of reaching it's goal, but, there is a large buffer of government officials, past or current.
I think this is an extremist political person that is motivated by ideology, hatred and anger.
One of the issues with the right wing voter that Republicans tap into is the very naive and low information topics they seek as power within their lives. I think there is a very real possibility a White Supremacist acted in believing there is a real movement that will come to the forefront of the power of the country. I also believe Rudy Guiliani is acting as a validation to that fact.
There is that horrible dialogue that existed after the 911 attacks whereby the power of the USA military was illustrated by stating, "Removing the head of the snake." That follows a rudimentary understanding of oppositional leadership. In this case, it follows people identified by President Trump and Rudy Guiliani as oppositional people with power within the country. I do not believe these targets are that of President Trump alone.
A journalist on MSNBC stated this was a fairly obscure and old meme that reflects a signature on the bomb. It seems to me if this is that obscure, could it be a Russian intelligence agent? They would lob onto something as hideous as this as a cultural icon. Islamic demonization of the identity. Somebody to really hate and at the same time entertain the American hate culture. Put differently, a validation of Trump policies that reflect racism.