Because to me it is exactly as irritating as the 'calls to prayer' but since we seem to accept the one I guess we have no option but to accept the other as well.
I'm trying to imagine the poor people living within earshot of both a church and a mosque.
Who says we accept them? Some people accept them, some people accept them in moderation, some people move away, some people look for options: https://news.ycombinator.com/item?id=10614084
It's super annoying but depending on the value of 'tradition' (whatever that means) the composition of the local council (which the article here actually refers to) and the laws in place already you may or may not be able to find a judge willing to put a stop to it. This can be an extremely long drawn out battle. Churches get away with lots of stuff that otherwise would not be tolerated.
I'm trying to imagine the poor people living within earshot of both a church and a mosque.