It happened to Michael Adebalajo. MI5 harassed him, and let him preach Jihad against Assad before Adebalajo lost the plot and killed Lee Rigby.
Looks like Rahami was provoked, wittingly or unwittingly, by the cops and this harassment was reinforced by his neighbours.
The prime suspect in the New York and New Jersey bombings sued his local police force and claimed they were persecuting him for being a Muslim.
Ahmad Rahami said in a lawsuit that cops in Elizabeth, New Jersey subjected his and his family to discrimination and 'selective enforcement' based on their religion.
The family claimed that police tried to shut down their chicken restaurant, called First American, too early each night with 'baseless' tickets and summonses.
Ahmad, 28, his father Mohammad Sr, 53, and his brother Mohammad, brought the lawsuit together and said that local residents also racially abused them and said: 'Muslims don't belong here'.
The lawsuit was filed in 2011 and reveals that Ahmad has a long history of grievances with city officials, their local police force and people who lived close to them.
[source : EXCLUSIVE: Wanted New York and New Jersey bomb suspect sued his local police claiming they PERSECUTED him for being a Muslim, Daily Mail, http://www.dailymail.co.uk/news/article-3796768/Ahmad-Rahami-sued-local-police-New-Jersey-claiming-persecuted-Muslim.html#ixzz4KiKQtGtl, 19th September 2016]