It would be interesting to see a comparison to a network carrier. That Wordpress blogblog is clearly anti LCC as with anything you can manipulate results and data to back your opinion. The aeroinside web page is a little more balanced but have a look at the incidents and all airlines have their fair share of them. Take a look at AvHerald and you will not see any correlation between LS and it having a higher than average rate of incidents.
Incidents of varying natures happen every day sometimes involving a full service airline, sometimes a LCC, sometimes an airline with aircraft of a certain vintage, and sometimes with brand new aircraft. Things happen. LS are an extremely safe airline, and I wouldn't hesitate to fly them.