It was a poorly-written, unimplementable deal that neither side took seriously.

Then why did Ukraine sign the two separate Minsk agreements if they never intended to follow them?

FURTHERMORE, the Minsk agreement was simply too unpopular in Ukraine for any government to survive implementing it.

Peace with Donbas was popular with Ukrainians. In the most recent elections the candidate that ran on a platform of peace with Donbas won the election and became president. Zelensky then went to the front and gave his "I'm not some loser" speech to Ukraine's militants on the front to try to deescalate the war. Once he failed to reign in his paramilitaries he began agitating for more war.

You are correct that it's unlikely that a Ukrainian government could survive implementing peace with Donbas. This isn't because it was unpopular with the people of Ukraine but because it was unpopular with the people in power. After the US-backed coup far-right elements were placed in positions of power in the Ukrainian government, especially in the police and military. If that failed, the US could have once again opened the floodgates of money from NGOs to anti-government protestors and replaced whoever the Ukrainian people elected with a more "pro-democratic" leader.

You're right that overall the central Ukrainian government wanted war too much to abide by the ceasefire treaties they signed. I just don't think that excuses them. Wanting war too much to do peace is literally what I'm criticizing Ukraine for.