There is no point in following a person who does not know where they are going. Jesus accused the religious leaders of being 'blind guides'. He also called them 'blind fools' because they did not understand how to handle truth themselves, and so could not teach truth to others. The issue in question was about swearing. Because so many people tell lies, swearing has become a method of reassuring people that what is said is true.
 

Dirty eating utensils like cups and bowls are a health hazard. The Pharisees were very particular to wash them in a ceremonial way which enabled everybody to see that the outside was clean. It was like that with the Pharisees themselves and so Jesus used their religious habits as a parable. He knew the inside of their hearts and saw through their holy rituals to the inner corruption that motivated their lives.
 

'Distance lends enchantment to the view' is an English saying which means that the further away something is, the better it looks. The defects are hidden and faint-sight allows the mind to create something beautiful out of ugliness. Jesus accused the Scribes and Pharisees of doing that with the tombs of martyred prophets.
 

The seven 'woes' of this chapter were not pleasant. But Jesus did not gloat over the Pharisees. We know that because at the end of exposing their hypocrisy and warning them of judgement, He released a flood of compassion for them so that His disciples hear. He wanted the trainee apostles to understand His deep love for the rebellious and hypocritical people who had systematically refused to submit to God. He knew they hated Him, but He still loved them. As leaders of the church, the disciples would have the same problem and needed Christ-like compassion.