Issue with adding of the debugbar at the last occurence in head

[victorchiriac89]

In my project I am showcasing some ways to do specific tasks in Magento 1 and 2.
So, in the php file:
https://github.com/barryvdh/laravel-debugbar/blob/master/src/LaravelDebugbar.php
At line: 914-915 I see the function is at follows:
// Try to put the js/css directly before the < /head>
$pos = strripos($content, '< /head>');

If I add in the content another < /head> then the entire pages does not work properly anymore.

What is the purpose of finding the last occurrence and not the first?