Assumption is a sickness in the minds of human beings. People will get confused when there is too much assumption. It is not wrong to assume, but do not take it for granted and making final conclusions out of it. Assumptions will create a lot of chaos if it is not contained. Harsh words will be thrown to each other or even to the public and therefore creating a discussion or arguments that need not to be taken place. Certain assumptions cannot be avoided in creating formulas or equation, but this as well should not be taken as a final conclusion. The link here (http://news.bbc.co.uk/1/hi/world/americas/8463657.stm) is about a Spanish politician whose picture was used by the FBI to create an older version of Osama bin Laden. Firstly, the FBI assume they can use the picture without seeking permission, as the politician has expressed his dissatisfaction with the FBI. Secondly, they're assuming Osama bin Laden looks like so. Do the FBI take for granted that the picture will not reach back to the politician? This is an assumption, but I do not put it into final conclusion and are not concluding that the FBI is ridiculous.
Why do people assume? From my point of view, this might be because it is a personal satisfaction that follows with the mood of the person at that certain time. That is only one perception, there are many other personal views on why people assume, but I cannot answer this in definite as I have not conducted proper research and it is just assumption on why people assume. So by doing this, the discussion will not go far by giving out personal reasons on why people assume.
Assumption on Islam and Shari'ah is also something that is definitely not right. Usually when the word "Shari'ah" conjures horrors of hands cut off, adulterers stoned and women oppressed. This is the perception of many in the West. The laws of most European countries in the 18th century authorised torture as an official of the criminal-justice system. Till the 18th century, the Common law denied married women any property rights. Islamic law had always granted women the property and this is only one point that shows the equality of the sexes in Islam. Some might disagree me with this but in Islam, the wife doesn't take the name of her husband. In the West, once married, the wife undertakes the name of the husband. From my perception, it shows that the wife is owned by the husband. In Islam clearly there are rights for the husband and the rights for the wife.
In Islam before an adultery conviction can typically be obtained, for example, the accused must confess four times or four adult male witnesses of good or noble character must testify that they directly observed the sex act. In Islamic deriving rulings, judicial sentence, law, assumption is no good and it is not enough for a person to convict another with just an assumption without concrete proof. So let us be free from bad assumptions.
I end this entry with a hadith Narrated by 'Aisha (Radi-Allahu 'anha): The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "The most hated person in the sight of Allah is the most quarrelsome person." [Bukhari Vol 3 No. 637].
Also a clip from Yusuf Estes.