Hong Kong limiting Visits

"China will limit visits by residents of the city of Shenzhen to neighbouring Hong Kong, a politician and the media said on Sunday, following recent tension in the former British colony over growing numbers of mainland visitors."
"Travel industry executives say political tension in Hong Kong including democracy demonstrations and protests against mainland shoppers, in which some people have been harassed, have discouraged mainland tourists."

So basically, Hong Kong will limit the visits, because of political instability.

The residents will have to apply for Visa's to visit Hong Kong.
What do you think about this.
Are their reasons justified?
Why would they do that?
Discuss

*Thanks to Ele for recommending a bit more detail*