The innocent are those trying to survive...in this case the disciples were hungry... Jesus takes them to a corn field, feeds them. The Pharisees judge this lawfully, yet miss the point of God's love, as God is here to feed the innocent.
The trouble with the Pharisees is that they taught sacrifice and showed little mercy; had they understood the word, and will of God; who prefers acts of humanity, compassion, and mercy, to the observance of rites and ceremonies; or had they the common affections of human nature, and those bowels of compassion which one man ought to show to another Jesus would have given them a good report, mercifully. The Pharisees had no mercy, and in every way laid terrible burdens upon the people suffering them to live sacrificially in all things. God doesn't expect or want that from us... the innocent are the down trodden, the fatherless, the poor, those who need God's blessing.
God just wants us to be humble, caring, giving heart to one another, with His kindness and mercy. The innocent, are the children of God trying their best to get along in this life, God sees a person for what resides within that heart. The innocent aren't out to offend anyone, and are often at the mercy of those in control. (maybe there is more to see, this is what I perceive.).
Edit: (((2 Cor: 3: 7-11) speaks about the veil of Moses, giving us a look at the veil of the Law which keeps us from seeing the Mercy of Christ. The Pharisees relished the ministry of condemnation; their ministry of ignorance and condemnation had or has a fleeting glory (mainly for themselves); Jesus came to give us lasting Glory that would banish that kind of ignorance and condemnation... Those who lived under the Law, had a veil upon their hearts , with Jesus the veil of ignorance is lifted by the tender mercies of God.)))