1) Russia has lied about everything
2) They have threatened to blow dams before
3) They admit to planning to blow up more dams
4) Destroying energy plants (i.e. civilian infrastructure) is their main focus
5) Ukrainians said they mined the dam
6) Russians admit they mined the dam
7) They have already blown up part of the dam previously

Will not release camera evidence
9) Will not allow an outside investigation
10) Will not do an internal investigation
11) They argue blowing the dam has helped them
12) They brag about their history of blowing dams
13) Russia raised level to max before blowing dam
14) They are not allowing civilians to evacuate area
15) They are not helping save civilian lives
16) They are firing on civilians trying to help
17) They are claiming the situation is not that bad (for affected civilians)
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(Ukrainian) HIMARS are not capable of destroying the dam (despite Russia's claims)
19) Ukraine would not do this before their upcoming counter-offence (there is no advantage to Ukraine)