On its blog, Twitter indicates that this denial of service attack is ongoing, geo-political in nature and that these types of attack will continue to be with us.
In the final analysis, it is a fundamental human right that is under attack. The freedom of expression. While it may not be directed at what I have to say, it affects me directly.
In a way that is right; it is a universal human right and there is no excuse for this. Twitter as a company does not want to speculate who is behind this, I am not in a position to speculate but I do despise whoever is behind this and I wish that their cause falters.