Because not doing so is a logical fallacy?

People can make, and have made totally bad choices about any area and perfectly good choices in another area.

For example you made a very bad argument logic-wise here. But still you may have something worth to say on some other matter...

Someone's personal hygiene bears no relationship to their knowledge or opinions on technology.

have you ever used a stackoverflow post AT ALL to figure out authentication, grep files, or set up a tool?

know how often each time they shower?

So you do everything perfectly huh?