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You should be able to delete them you just have to enable root in the options of es file manager.
is it safe to delete all of them? Or not
yeAh but my memory is going down everday I had 818 mb and today I have 785How much space are they taking up? I wouldn't bother unless they are huge. It doesn't hurt to have them there.
I wouldn't be deleting files in your root directory because of low storage. The cache partition and files is what you should be deleting.
Find out what apps are storing alot of files and delete those first. You will be surprised how much some of them actually save. I found out my Google Currents magazine app was storing over 1.5 gb of cache files!

Your phone isn't losing memory (RAM). It is internal storage (hard drive). Did you install/update anything on your phone (apps)? The log files take up space, but they don't hurt anything if you don't need the space.
it won't harm my phone att all if I delte those files? Wojt my phone need those files if I delete them?