[geoffreyhale]

Aggression is violent and seeks to harm or at least disregards the recipient's well-being.

Assertiveness is considerate and has compassion for the recipient, considers how our assertion may affect the recipient, may offer understanding and empathy for their situation, then asserts our need by taking personal ownership and using "I" language, etc.

[jugg1es]

This is a curious statement. Assertiveness does not require that you be explicitly or even implicitly empathetic nor does it require you to use "I" statements. In fact, deliberately using language where you are making a topic personal (by using "I" language) is the opposite of assertive in this context.