2. Question: Why are you allowed to put yourself into a position where you would have to make a blessing for washing but shouldn’t put yourself into a position where you would have to say a blessing for tzitzis?
Background:
A. There is a general rule that one should not make a blessing if he does not have to for it is saying Hashem’s name in vain.
B. Tzitzis scenario: If one wore his tzitzis overnight the Mishna Berura (8:16:42) brings an argument of whether one has to make a blessing on them in the morning and when in doubt by blessings one should be lenient and not say it. However, the Mishna Berura says if he took off the tzitzis in the morning with in mind not to put them back on immediately then everyone agrees he should make a blessing upon putting it back on but ideally it is not right to take this advice because he will be saying an unneeded blessing according to those who say you do fulfill the mitzvah of tzitzis at night.
C. The washing hands scenario is where one is unsure whether he said the blessing upon washing in the morning or if he washed his hands unintentionally before a meal with bread, the Mishna Berura (4:30, 33) says one should ideally put himself in a position where he would definitely have to make a blessing. In the Be’ur Halacha (159:12 “lichatchila”) he says about someone who unintentionally washed for a meal, that though according to most Rishonim he doesn’t have to wash again but if he can get more water he should wash again and it is better to sully his hands so that he will be obliged to say a blessing according to everyone.
Answer: In the Be’ur Halacha (25:5 “vitov”) the Chofetz Chaim explains by washing that since it must be done because of the doubt then it is not considered an unneeded blessing but by the tzitzis just don’t take them off and it won’t prompt a need to say another blessing. Anyway, it is better to exempt the tzitzis with the blessing over a tallis either you put on or if someone else puts on with their blessing.