They don't want surgery. Christians who want to be involved in Christ and to live unspiritual lives simultaneously fight God. They don't want surgery. Christians that regard spiritual defects to be spiritual assets fight God. Ungodly attitudes are an asset in defending the truth.
Hard hearts are an asset when stressing obedience.
Being without emotion is good because emotions produce error. Being a legalist is good because law keepers will not make the mistakes that are made by those who love, show compassion, and are merciful. They don't want surgery. Because stumbling blocks prevent God from saving lives. A stumbling block person creates temptation.