Okay - let's see...

So, Los Angeles has decided to control crime by instituting a ban on standard capacity magazines that hold more than 10 rounds.

Seems we need to look more closely at whether this will work.

1.  So, possessing a magazine that can hold more than 10 rounds will be a misdemeanor.  As the story notes, the NRA is likely to file suit against the ordinance; as with most such laws, they contend it is likely to affect those who follow the law as opposed to those who a committed to breaking it.

2.  In truth, the NRA is correct.  Especially given it is a misdemeanor. Let's say you are a criminal (as far as I know you may be), intent on committing armed robbery, assault, or even murder.  This law assumes you will go ahead with your plan, but because you might be found guilty of a misdemeanor, you will do so with magazines that can hold no more than 10 rounds.  Catch that - you are a mass killer and this will keep your body count down because, although you are about to commit felony murder, you will be forced to carry downloaded magazines due to a potential misdemeanor charge. Right!

3.  Still trying to figure out what it means to say, "cities like San Francisco, Sunnyvale and now Los Angeles have taken the issue into their own hands, passing bans on high capacity weapons."  What is a high capacity weapon? I suspect this is a reflection of ignorance about what it being discussed.

Bottom line here - let's take the recent LA theater shooter as an example.  Imagine he is planning to commit this crime.  He surveyed the theater, knew it was a gun-free zone, is confident he will confront no resistance, makes his plan to come into the theater. He has his pistol, a .40 cal S&W with a 13 rounds magazine.  Looks down and notes "Oh well, can't carry that into the theater - this magazine holds more than 10 rounds and I might be charged with a misdemeanor".

That is how these people think.