Corner Cutters

I find myself bothered by foot traffic that doesn't obey walking rules.  For example:

1. Walk on the sidewalk.
2. Walk on the right side of the sidewalk; especially if you're reading, texting, or otherwise not paying attention to oncoming foot traffic.
3. Walk through the right-side of the double-doors, even if you think someone else isn't coming.

What am I missing?  Am I the only one that's bothered?  Is it me or is it them?  

I either need to understand "them"; be converted to "their" ways; or take a step back, breathe, and feel peace.