Language changes over time. The term suffer may well mean allow for. The term longsuffering comes to mind.
Violence here may be more in line with a struggling persistence. That is, not so much violent, but characterized by a active perseverance to a specific end.
Some examples:
...Jacob wrestling with God and not giving up without receiving a blessing
...the woman with the blood issue who fought through the crowd to touch Jesus
...blind Bartimeus who was told to be quiet, but yelled all the louder
In other words, the kingdom of God is appropriated by acts that demonstrate unwavering faith where people refuse to take "no" for an answer from God. Real faith at work.