Venezuelan opposition leader Lopez has been formally charged with inciting violence.

"Inciting violence" must be interpreted in a narrow and strict sense or else human rights are in danger.

The opposition gets its strength from the shortages of certain goods. The US can't be responsible for that. Buying goods from subsidized stores and reselling them could cause the state to lose money, but would not cause a general shortage of those goods in the country. It is Maduro's economic policies that cause the shortages.