"....mature sciences deteriorate into ideologies...."

That is true.

Thinking about why this happens.... could it be the vanity of people that causes this? Sticking to ideas or practices because its 'their' ideas/practices/traditions (irrespective of if they have been passed down or been indoctrinated themselves) instead of looking at the logic behind them or their relevance to the present or future or a situation? and then decide if they should be still held on to or not?

What if we define 'ideology' as the thought/belief equivalent of 'tradition' as 'tradition' is to practices/rituals - both being 'holding on to something' irrespective of its relevance? I guess that would make both of our statements mean absolutely the same.