How do Buddhists justify or explain that monks and/or temples amass and use wealth?

This question applies mainly to Theravada Buddhism, which is the prevailing branch of Buddhism in my country (Sri Lanka). I've observed, many times, how many temples and monks are amassing wealth and influence. Some monks travel in luxury vehicles. Some buy expensive phones. These are just a few examples that comes to mind. How is practices like this aligned with Buddhism, i.e. how is it justified or explained by Buddhists? Also note that I emphasize "some", and not all.