Why has the majority traditionally been reluctant to change the rules to prevent or restrict filibusters?

What will be an ideal response?

An ideal response will:
1, Explain that it is always difficult to obtain the agreement of two-thirds of the Senate on a controversial matter. (Changing the rules requires 67 votes.)
2, Explain that every senator knows that he or she might be in the minority on an issue at some time. A filibuster gives senators who are in the minority a powerful weapon for defending their (or their constituents') interests.