They can have their free speech. The complaints are ones of taste, and I personally wholeheartedly concur. This kind of stunt is very childish, it plays into “personality cults”, and frankly it doesn’t do the conservative image very much good at all.
Throwing eggs at a picture of the “one” may be emotionally very satisfying, but I doubt its going to change many people’s voting habits - and that is much more important.
Understand something about the militant left - nothing is about reason with them. You will never win an argument with them. It's all about feelings and their internal emotional states not about any sense of reality. It's why every totalitarian state is concerned to the point of obsession about iconography - it's a means of conditioning you to accept tyranny as a fundamental truth. It's why desecrating the icons of the totalitarian state is seen as the supreme crime - it breaks the spell and makes totalitarian government impossible.