MILWAUKEE — In the hour after former President Donald Trump was apparently struck in the ear with a projectile at a rally in Pennsylvania, people preparing for the Republican National Convention in Wisconsin met the news with a mixture of shock, bewilderment and vigilance. Michelle Altherr, a Republican National Convention delegate from Arizona, stood outside Fiserv Forum rages: “When you think about it, you’re like, no, this just ramped up to another level. If you thought we were MAGA and extreme before, we went to another level now. When you see on the video Trump is mouthing ‘fight, fight’ …