Its partly an education problem and most botanists, foresters, biological scientists, habitat ecologists, etc. are introverts who just want to be left alone to study their sciences. They aren't that great at getting the message out and/or educating the public.
Can't put all that solely on the step of the "people" that they cant identify plants...they need education, they need to be presented with the facts, and shown the impacts.
Not everyone gets to spend their time in college and over 30 years slam-banging around the woods, prairies and plains, getting paid for identifying plants, collecting data, data analysis, etc. like I have...