For many, the exchange in the email between Trump, Jr. and the man representing Russian envoys is all they need to know. For them, evidence of collusion is concrete, particularly Trump, Jr.'s response: "If it's what you say I love it especially later in the summer."
The president himself spoke out in favor of his son, arguing any campaign operative would have taken such a meeting.
Most politicians would have gone to a meeting like the one Don jr attended in order to get info on an opponent. That's politics!