why Yaakov was upset at Shimon and Levi

I had a thought as to why Yaakov was angry at Shimon and Levi for attacking Shechem.  We know that David haMelech was prevented from building the Beis HaMikdash because he had engaged in bloodshed and warfare his entire life.  Yaakov was en route to the spot where Hashem had appeared to him in a dream when he left home and where he had taken the neder וְהָאֶ֣בֶן הַזֹּ֗את אֲשֶׁר⁠־שַׂ֙מְתִּי֙ מַצֵּבָ֔ה יִהְיֶ֖ה בֵּ֣ית אֱלֹהִ֑ים.  This is the same idea - יִהְיֶ֖ה בֵּ֣ית אֱלֹהִ֑ים - as building Beis haMikdash!  Yaakov was afraid that if he got bogged down in wars as a result of Shimon and Levi's attack on Shechem it would prevent him from fulfilling his neder.  (It is shortly before shabbos here so I haven't looked to see if any meforshim say this. Just throwing it out there for now.)