The individuals that protested Trump prior to Chicago clearly went out of their way to sabotage his speeches and malign his supporters. They did not go there to engage in policy discussion at a meet-and-greet venue, for example, as they had did with Cruz.
If Cruz is nominated, his "brilliant" discussion on policies will be no match for the hundreds of BLM mobs and agitators that will reign down on his rallies.
Code Pink set out to disrupt the Cruz event too, but left defeated and with no excuse to retaliate.