Oh, analogies with physical world ... I always loved the one that said "but it's exactly the same as stealing a car".
Anyway, the analogy is stupid for a number of reasons:
(1) With a lock on my door, I'm protecting my property, that I'm not willing to share with anyone else. DRM protects something that is being shared (sold) with customers.
(2) While a lock on a door may be broken / lockpicked, it needs to happen every single time. Whereas when a DRM scheme is broken, it's broken one and for all.
(3) While a lock may be lockpicked, that need to happen in public, in limited time etc. Whereas breaking DRM may happen in a nice calm place, take arbitrary amount of time etc.
(4) I certainly don't put a lock on the main door, while leaving the back door and all the windows open. Yet we'll get DRM in the browser and unprotected DVDs, blurays etc.
So let me reiterate - all the paying customers will get a binary blob from Adobe into their browsers (and I'm one of those who got the nice rootkit surprise from Sony a few years ago), but the actual pirates won't even notice this. Either they'll break or workaround the DRM somehow (which really won't be all that difficult), or they'll use a different source (e.g. dvds/blurays, ...).
And not only that the paying customers will have to install the blob - it's actually illegal to analyze the code, researchers are afraid to even report security issues in it because of possible prosecution.
Which is pretty much the problem with the DRM - the purpose is not to protect the content directly (because of all the weaknesses), but to make the prosecution easier (breaking the DRM vs. violating copyright etc.).