Stupid or inconsiderate?

Is it just me or do others feel the same way, have people gotten stupider over the years or just much more inconsiderate? We all know what happens if you give a cashier some change after he already punched the amount he tendered into the register. So I think we can all agree, that is definitely on the stupidity end.
What about the person who stops their car in the left lane when there is a ton of traffic coming up behind them, forcing everyone behind them to slam on their brakes. The reason they stopped was because his right hand turn was coming up and instead of continuing on to the next intersection or exit which would have added a few extra minutes to their trip, and not risk a rear end collision, they decided the hell with everybody else, it’s all about me. Is this stupidity or inconsideration?

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