Certainly the Church-at-large misses out on following the heartbeat of Jesus' agenda. But Jesus wasn't as quick to squash zealousness in the public square as you might think.
Nowhere is Simon referred to as "Simon the ex-Zealot." Nowhere is there a hint of the elitist attitude within Jesus that we find among many evangelicals who would not ever want to be caught in the same picture or the same heaven with a Jerry Falwell type. No, Jesus didn't stay at arms' length from Simon the Zealot. Rather, He picked him as a disciple.
Interesting the way our Lord chose His disciples. On the one hand, Simon le terroriste, as the French Bible calls him, an ultra-nationalist. OTOH, Philip, named after the dad of the dude who'd conquered Israel, bringing in hellenic ideals of beauty (and sodomy), and leaving the expression "apakorish" (epicurean) as a term of hebraic contempt that has endured to this day.